Min is using a model to add 3/10 and 4/10. First, he draws a rectangle and separates it into 10 equal pieces. Then, he shades 3 of those pieces. To add 3/10 and 4/10 using a model,
Min should follow the steps below.
Step 1: Draw a rectangle and separate it into 10 equal pieces.
Step 2: Shade 3 pieces out of the 10 pieces.
Step 3: Shade an additional 4 pieces out of the remaining 7 unshaded pieces.
Step 4: Count the total number of shaded pieces, which is 7.
Step 5: Divide the total number of shaded pieces by the total number of pieces in the rectangle. This gives the fraction 7/10.
Step 6: Therefore, the sum of 3/10 and 4/10 is 7/10.
Min should shade an additional 4 pieces out of the remaining 7 unshaded pieces next to add 3/10 and 4/10 using a model.
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Wallace works at the Computer Wholesale Warehouse, where he develops visual impressions of products for advertisements and marketing materials. What type of work does Wallace perform
The required, Wallace performs graphic design work at the Computer Wholesale Warehouse.
Based on the description provided, Wallace performs visual design or graphic design work at the Computer Wholesale Warehouse. He develops visual impressions of products for advertisements and marketing materials. This involves creating visual elements, such as graphics, images, and layouts, to effectively convey messages and promote products.
Wallace's role at the Computer Wholesale Warehouse involves performing visual design work to create captivating visual impressions of products for advertisements and marketing materials, contributing to the overall effectiveness of their promotional efforts.
Thus, the required, Wallace performs graphic design work at the Computer Wholesale Warehouse.
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3a) Write the simplified expression for the area of the shape below.*
1point
The simplified expression for the area of the shape is 8x square units.
In the given figure of rectangle,
Given that,
Length of rectangle = 2x
And width of rectangle = 4
Since we know that,
Rectangles are four-sided polygons with all internal angles equal to 90 degrees. At each corner or vertex, two sides meet at right angles. The rectangle differs from a square in that its opposite sides are equal in length.
We also know that,
Area of rectangle = length x width
= (2x)(4)
= 8x
Hence expression of area = 8x square units.
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The complete question is attached below:
A space vehicle is orbiting Earth in a circular orbit. What radian measure corresponds to (a) 2. 5 orbits? (b) 3/2 orbit?
a) The radian measure is 5π radians.
b) The radian measure is (3πr)/2 radians.
To determine the radian measure corresponding to a certain number of orbits in a circular orbit, we need to know the circumference of the orbit.
The circumference of a circle is given by the formula C = 2πr, where C represents the circumference and r represents the radius.
Let's assume the radius of the circular orbit is denoted by "r."
(a) To find the radian measure for 2.5 orbits:
The total angle covered in 2.5 orbits is equivalent to 2.5 times the full circumference of the orbit.
Angle = 2.5 * (2πr) = 5πr
Therefore, the radian measure corresponding to 2.5 orbits is 5π radians.
(b) To find the radian measure for 3/2 orbit:
The total angle covered in 3/2 of an orbit is equivalent to (3/2) times the full circumference of the orbit.
Angle = (3/2) * (2πr) = 3πr/2
Therefore, the radian measure corresponding to 3/2 of an orbit is (3πr)/2 radians.
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Trigonometry Pile Up!
How long is this side?
1.7 cm
71
21
1.7 cm
2.2 cm
4.3 cm
53
377
2.1 cm
42
3.2 cm
3.8 cm
3.6 cm
2.9 cm
2.5 cm
34
8 cm
The given options are 1.7 cm, 71, 21, 1.7 cm, 2.2 cm, 4.3 cm, 53, 377, 2.1 cm, 42, 3.2 cm, 3.8 cm, 3.6 cm, 2.9 cm, 2.5 cm, 34, and 8 cm.
The summary of the answer is that the length of the side is 2.2 cm.
In trigonometry, it is common to use the concept of a right triangle to relate the lengths of its sides with the trigonometric functions. However, without additional context or information about the triangle or the specific problem, it is not possible to determine the length of the side accurately.
Among the given options, the length of the side closest to 2.2 cm is 2.2 cm itself. Therefore, based on the options provided, we can conclude that the length of the side is 2.2 cm. However, it is important to note that without further information or context, this is an assumption based solely on the given options and may not be the correct answer in a different context or problem.
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if the division expression is 7 divided into 3 what is the unit form
The division expression is 7 divided into 3 which can be represented in unit form as follows; 7 ÷ 3 = 2 R1, this means that 7 divided by 3 equals 2, with a remainder of 1.
The remainder is the value left after an integer has been divided by a divisor, such as the number left over after a long division of 7 ÷ 3. Therefore, the value of circle plus circle is given by the formula: $$\text{Circle plus Circle} = πr_1^2 + πr_2^2$$ where r1 and r2 are the radii of the two circles respectively. If the values of the radii are provided, then we can substitute them in the above formula to find the value of circle plus circle.
The area of a circle is given by the formula A = πr² where A is the area of the circle and r is the radius. Therefore, the formula for the value of circle plus circle is given by Circle plus Circle = πr1² + πr2² where r1 and r2 are the radii of the two circles respectively. As we already know that a circle is a geometric figure having no end. It has many properties. One of its properties is that its area can be measured. When we talk about the area of a circle, we are referring to the region enclosed by it. The area of a circle is given by the formula: A = πr², where A is the area of the circle and r is its radius. The symbol π represents the constant pi, which is approximately equal to 3.14. Therefore, the area of a circle is proportional to the square of its radius. If we have two circles with radii r1 and r2, then the area of the first circle is given by A1 = πr1², and the area of the second circle is given by A2 = πr2².
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What score must a learner earn on the ACT composite test in order for the score to be at the 87.49th percentile? Round up to the nearest whole number.
Many students take standardized tests for college applications. They are called standardized tests because they are scored so the population of student scores for any one particular test follows a normal distribution. The most common test are the SAT and the ACT.
Suppose the mean and standard deviation for the ACT composite score, the SAT critical reading score, and the SAT mathematics score for the year 2017 are as follows:
For the ACT, the mean composite score was 21.0 with a standard deviation of 5.2.
For the SAT critical reading score, the mean was 501 with a standard deviation of 112.
For the SAT mathematics score, the mean was 516 with a standard deviation of 116
a. 32
b. 43
c. 27
d. 19
Answer:
27
Step-by-step explanation:
You want to know the ACT composite test score for the 87.49th percentile, given the ACT scores have a mean of 21.0 and a standard deviation of 5.2.
Z-scoreThe Z-table in the first attachment shows you the Z-value of the 87.49th percentile is 1.10+0.05 = 1.15.
ScoreThe corresponding score is ...
X = μ +σZ
X = 21.0 +5.2·1.15 ≈ 27
A learner must earn a score of 27 to be at the 87.49th percentile on the ACT composite test.
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Last night there were 100 people the attended the school play. There was a combination of adults and children that attended the event. Each child ticket cost $5 and each adult ticket cost $8. There was a total of $626 collected at the door. Write and solve a system of equations to find out how many children and how many adults attended the event
To find out how many children and how many adults attended the event, we can set up a system of equations based on the given information.
Let's use the variables c and a to represent the number of children and adults, respectively. The total number of people who attended the event is 100, and the total amount collected at the door is $626. Each child ticket costs $5, and each adult ticket costs $8. By setting up and solving a system of equations, we can determine the values of c and a.
Let c represent the number of children and a represent the number of adults who attended the event. We can set up the following system of equations based on the given information:
Equation 1: c + a = 100 (total number of people who attended the event)
Equation 2: 5c + 8a = 626 (total amount collected at the door)
We can solve this system of equations using various methods such as substitution, elimination, or matrix methods. Here, we'll solve it using the substitution method.
From Equation 1, we have c = 100 - a. Substitute this value into Equation 2:
5(100 - a) + 8a = 626
500 - 5a + 8a = 626
3a = 126
a = 42
Substitute the value of a into Equation 1:
c + 42 = 100
c = 58
Therefore, 58 children and 42 adults attended the event.
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A water pump can pump 13.2 gallons of water in a pool every minute how much water will be remove in 15 minutes
In 15 minutes, a water pump capable of pumping 13.2 gallons of water per minute will remove a total of 198 gallons of water from the pool.
If a water pump can pump 13.2 gallons of water in a pool every minute, we can calculate the amount of water it will remove in 15 minutes by multiplying the pumping rate by the duration. Therefore, 13.2 gallons/minute x 15 minutes = 198 gallons. During the 15-minute period, the water pump will continue to operate at a constant rate, removing water from the pool. Each minute, 13.2 gallons of water will be pumped out. When we multiply this rate by the duration of 15 minutes, we find that a total of 198 gallons of water will be removed from the pool. It's important to note that this calculation assumes a constant pumping rate without any interruptions or changes in efficiency.
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Calculate a 15% tip for a restaurant bill of $42.40. Remember to make sure that your answer is reasonable.
To calculate a 15% tip for a restaurant bill of $42.40, we multiply the bill amount by 0.15 to find the tip amount. The result will provide the tip amount, which can be added to the bill to get the total amount to pay. Therefore, a 15% tip for a restaurant bill of $42.40 is $6.36.
To calculate a 15% tip, we take 15% of the bill amount. The tip amount is found by multiplying the bill amount by the decimal equivalent of 15%, which is 0.15.
Given the restaurant bill of $42.40, we can find the tip amount by performing the calculation: $42.40 * 0.15 = $6.36.
Therefore, a 15% tip for a restaurant bill of $42.40 is $6.36.
To check if the answer is reasonable, we can consider the percentage amount and the total bill. A 15% tip is generally considered an average or moderate tip amount. Given the bill of $42.40, a tip of $6.36 seems reasonable in relation to the bill total.
However, tipping customs may vary in different regions or based on personal preferences. It is always advisable to consider the overall service quality and local tipping practices when determining an appropriate tip amount.
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Write a rule relating to the minutes, x, to the number of pages, y. Then find the number of pages when the minutes equal 72.
The number of pages read in 72 minutes is 144 pages.
When given a table of values, the relationship between the values is often expressed as a rule or an equation. A formula that links the number of pages in a book to the number of minutes it takes to read it is often used in book reviews or book reports.
Rule relating to the minutes, x, to the number of pages, y
Let us assume that reading x minutes corresponds to y pages. In other words, we want to identify an equation or formula that links the two variables.
The number of pages read in one minute is calculated by dividing the total number of pages by the total time it takes to read them.
y / x = k, where k is the constant of variation, or the number of pages that can be read in one minute. If the number of pages is directly proportional to the number of minutes, then the k value remains constant.
If we solve for y, we get the following:
y = kx
When the minutes equal 72, we will find the number of pages.
We know that k is a constant, so we may use any of the given (x, y) pairs.
The given minute value is x, and we want to find the corresponding page value, y.
Let us assume that 120 pages can be read in 60 minutes.
We may solve for k using this information:120 / 60 = k2 = k
Now that we know k, we may use the equation to determine the number of pages that can be read in 72 minutes:
y = kx
y = 2 * 72y = 144
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Someone help me do this
Answer:
I believe it's A
Step-by-step explanation:
Nadia has £5 to buy pencils and rulers. She says,
"I will buy 15 pencils. Then I will buy as many rulers as possible
With my change I will buy more pencils. "
How many pencils and how many rulers does she buy?
Nadia has £5 to buy pencils and rulers. She says,"I will buy 15 pencils. Then I will buy as many rulers as possible. With my change, I will buy more pencils.
"Let the price of each pencil be p and the price of each ruler be r. Presenting the above scenario into the equation,15p + (x × r) = 5Here, x is the number of rulers to be bought. To minimize the number of pencils Nadia will buy with the change, we have to calculate the maximum number of rulers she can buy with the given £5.Let's assume Nadia buys a maximum of y rulers with all of her money, thus the number of pencils she will be left to buy will be,15p + (y × r) ≤ 5Therefore, Nadia can purchase 15 pencils and 2 rulers with £5 as shown below,15p + (2 × r) = 5Nadia can then buy more pencils with the remaining money, which is,£5 − [(15 × p) + (2 × r)] = Remaining money£5 − [(15 × 0.20) + (2 × 0.35)] = 0.40Hence, Nadia can buy 2 rulers and 15 pencils. She can buy only 2 rulers as many rulers she can buy with £5 is only 2.
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Andrew dropped a rock from a cliff 49 meters high. The function
h(t)=−4.9t^2+49
represents the height of the rock, in meters, t seconds after he dropped it. Approximately how many seconds did the rock take to reach the ground?
To find approximately how many seconds the rock took to reach the ground, we need to determine when the height, h(t), becomes zero.
Setting h(t) = 0 in the equation -4.9t^2 + 49 = 0, we can solve for t.
-4.9t^2 + 49 = 0
4.9t^2 = 49
t^2 = 49 / 4.9
t^2 = 10
t ≈ √10
Therefore, the rock took approximately √10 seconds to reach the ground.
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An engineer is designing a storage compartment in an aircraft. The compartment's volume is 72 cubic meters. The width is 2 meters longer than the length. The height is 1 meter less than the length. Find the dimensions of the compartment.
An engineer is designing a storage compartment in an aircraft. The compartment's volume is 72 cubic meters. The width is 2 meters longer than the length. The height is 1 meter less than the length. the dimensions of the compartment are 4m × 6m × 3m.
Find the dimensions of the compartment. Solution:The volume of a rectangular prism is given by;[tex]`V= l × w × h`[/tex] Given that the compartment's volume is 72 cubic meters, let's substitute[tex]`V = 72`[/tex]
cubic meters;[tex]`l × w × h = 72`[/tex]
We also know that;[tex]w = l + 2h = l - 1[/tex]
Substituting w and h in terms of l, we get;[tex]`l(l+2)(l-1) = 72`[/tex]Expanding,
we get;[tex]`l(l²-1) + 2(l²-1) = 72`[/tex]
Simplifying, we get;[tex]`l³ + l² - 2l - 74 = 0`[/tex]
We will use trial and error method to find one of the roots,`l= 4`.
By substitution, we get;[tex]w = 4 + 2 = 6m h = 4 - 1 = 3m[/tex]
Thus, the compartment dimensions are 4m × 6m × 3m. The width is 6 meters, the length is 4 meters, and the height is 3 meters.
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Solve the equation. Check the solution.start fraction lower t over 6 end fraction = 12
The solution to the equation start fraction lower t over 6 end fraction = 12 is lower t = 72. And, to check the solution we have substituted the value we got for lower t in the original equation and verified if it satisfies the equation or not.
The given equation is,start fraction lower t over 6 end fraction = 12To solve for the equation we have to first, cross-multiply both sides of the equation with 6. This will help us to get rid of the fraction.start fraction lower t over 6 end fraction = 12. Multiplying both sides by 6:lower t = 72The solution for the given equation is, lower t = 72.Now, we have to check whether the solution we found is correct or not. We can do this by substituting the value we got for lower t in the original equation.start fraction lower t over 6 end fraction = 12Putting the value of lower t, we get:start fraction 72 over 6 end fraction = 12. Simplifying this, we get:12 = 12.The value of lower t we found satisfied the original equation, therefore the solution is correct.
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The line of best fit can be represented by the equation y=−6x+97, where x represents the number of absences and y represents the final grade.
The line of best fit is a straight line that best fits the scattered data points on a scatterplot. It is represented by the equation y = mx + b, where m is the slope of the line and b is the y-intercept.
In this particular case, the equation of the line of best fit is y = -6x + 97, where x represents the number of absences and y represents the final grade.
This means that for every additional absence a student has, their final grade is expected to decrease by 6 points. The y-intercept of 97 means that if a student had zero absences, their predicted final grade would be 97.
It is important to note that the line of best fit is a prediction, and not a definitive statement about the relationship between the variables. While it can provide some insight into the relationship between the number of absences and final grade, there may be other factors that are not taken into account by the model.
Additionally, the equation of the line of best fit is only valid within the range of the data used to create the model. Extrapolating beyond this range may not produce accurate predictions.
Overall, the line of best fit is a useful tool for analyzing relationships between variables, but it should be used with caution and in conjunction with other analyses to get a complete understanding of the relationship between variables.
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The boxandwhisker plots below represent the scores for pre and postwritten tests for applicants obtaining their driver’s licenses. A passing score is 70%. Which of the following is best supported by the information in the graphs? A. Exactly 25% more applicants passed the posttest than the pretest. B. Exactly 50% more applicants scored below the passing score on the pretest than on the posttest. C. Of all the applicants that passed the pretest, only 25% scored higher than a 90. D. Of all the applicants that passed the posttest, only 50% scored between a 70 and an 80.
The price of everything in the store is reduced by 1/4 each hour until closing time. Liz wants to purchase a shirt that was originally marked at 24$. You can use a function to describe the shirts price x hours after the sale starts.
A one-kilogram cake is divided into 3 pieces whose weights are in the ratio 1:2:4. What is the weight of the second piece?
EXPLANATION ALONG WITH ANSWER NEEDED. Wrong answers and answers without explanation- will be reported.
Considering the ratio provided for cake pieces, the weight of the second piece of the cake is 2/7 kilograms.
Given that a one-kilogram cake is divided into 3 pieces whose weights are in the ratio 1:2:4.
We have to find the weight of the second piece.
Steps to find the weight of the second piece
Step 1: Let the three parts of the cake be x, 2x, and 4x respectively, where x is the weight of the first part of the cake.
Step 2: Find the total weight of the cake:
x + 2x + 4x = 7x
Total weight of cake = 7x
Total weight of cake = 1kg
Therefore,
7x = 1 kg
Or x = 1 / 7 kg.
Step 3: Find the weight of the second part of the cake (2x):
Weight of the second part of the cake = 2x
= 2 × (1 / 7)
= 2 / 7 kg.
Weight of the second part of the cake is 2/7 kilograms.
To conclude, the weight of the second piece of the cake is 2/7 kilograms.
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Prove that the line joining the midpoint of a median to a vertex of the triangle trisects
the side opposite the vertex considered.
The line joining the midpoint of a median to a vertex of a triangle trisects the side opposite the vertex considered.
Let's consider a triangle ABC with median AD and midpoint M of AD. We want to prove that line BM trisects the side AC at point N.
To prove this, we can use the following steps:
Draw line BM and extend it to meet side AC at point N.
Since M is the midpoint of AD, we have AM = MD.
By the midpoint theorem, we also know that BM is half of AD, so BM = MD.
Therefore, we have AM = MD = BM.
We also know that triangles ABM and NBC are similar by angle-angle similarity, since they share angle B and have angles ABD and CBN that are alternate interior angles.
This means that the corresponding sides are proportional, so we have: AB/BM = BN/NC AB/MD = BN/NC (substituting BM=MD)
Multiplying both sides by 2, we get: AB/AD = 2BN/NC
Since AD is a median, we know that AB/AD = 1/2.
Substituting this into equation from step 7, we get: 1/2 = 2BN/NC
Solving for BN, we get: BN = NC/2.
This shows that line BM trisects side AC at point N.
Therefore, we have proved that the line joining the midpoint of a median to a vertex of a triangle trisects the side opposite the vertex considered.
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Simplify this numerical expression using the order of operations. 5. 75 - 1 2 (20 ÷ 2. 5) ÷ 2 6 Order of Operations: 1. Evaluate within parentheses. 2. Evaluate exponents. 3. Multiply and divide from left to right. 4. Add and subtract from left to right. What is the value of the expression?.
The value of the given expression is approximately 71.31.
[tex]$$75 - 12(20 ÷ 2.5) ÷ 26$$[/tex]
The Order of Operations states that the sequence of steps in which we carry out the operations of a given problem.
So, we follow the Order of Operations to solve this expression.
Firstly, we will evaluate the parentheses:
[tex]$$20 ÷ 2.5 = 8$$[/tex]
Now, the given expression becomes:
[tex]$$75 - 12 × 8 ÷ 26$$[/tex]
Then, we will evaluate multiplication and division in order from left to right.
12 × 8 = 96
So, the given expression becomes:
[tex]$$75 - 96 ÷ 26$$[/tex]
Evaluating division, we get:
[tex]$$75 - 3.6923$$[/tex]
Now, we will add and subtract from left to right.
[tex]75 − 3.6923 ≈ 71.31[/tex]
Therefore, the value of the given expression is approximately 71.31.
So, the required is approximately 71.31.
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You buy two tickets to an escape room using a coupon for $5 off your entire purchase. You pay a total of $45. 15 which includes 7% sales tax. What is the original price of one ticket?
The original price of one ticket is $37.50.
The original price of one ticket as x.
A coupon for $5 off the entire purchase, the price after the coupon is the total price minus $5. So the price after the coupon is $45.15 - $5 = $40.15.
The price after the coupon includes 7% sales tax, up the equation:
(1 + 7%) ×x = $40.15
To calculate the 7% sales tax, $40.15 by 1.07:
$40.15 / 1.07 = $37.50
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Which shows one way the equation can be represented in words? z minus 6 = 1. 4 The difference of a number and z is the same as one and four-tenths. A number subtracted from one and four-tenths is equal to six. Six less than a number is the same as one and four-tenths. Six decreased by a number is equal to one and four-tenths.
The correct representation of the equation "z minus 6 = 1.4" in words is "The difference of a number and z is the same as one and four-tenths."
The equation "z minus 6 = 1.4" can be represented in words as "The difference of a number and z is the same as one and four-tenths." This representation accurately conveys the meaning of the equation.
Let's break down the equation to understand its components. "z minus 6" represents the difference between the number z and 6. The equal sign indicates that this difference is equal to "1.4", which means one and four-tenths.
Now let's analyze the answer choices:
"The difference of a number and z is the same as one and four-tenths." This choice correctly represents the equation, expressing that the difference between a number and z is equal to 1.4.
"A number subtracted from one and four-tenths is equal to six." This choice represents a different equation, where a number is subtracted from 1.4, resulting in six. It does not match the original equation.
"Six less than a number is the same as one and four-tenths." This choice represents a different equation, where six is subtracted from a number, resulting in 1.4. It does not match the original equation.
"Six decreased by a number is equal to one and four-tenths." This choice represents a different equation, where six is decreased by a number, resulting in 1.4. It does not match the original equation.
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devika pours 4.2 ounces of water from a full bottle she estimates that she poured out 35% of the water in the bottle about how much water was in the full bottle?
Devika poured out 4.2 ounces of water, which is approximately 35% of the water in the full bottle.
To find out how much water was in the full bottle, we can set up a proportion.
Let x represent the amount of water in the full bottle (in ounces). We know that 4.2 ounces is 35% of x.
We can set up the proportion:
4.2 / x = 35 / 100
To solve for x, we can cross-multiply:
4.2 * 100 = 35 * x
420 = 35x
Dividing both sides of the equation by 35:
420 / 35 = x
12 = x
Therefore, there were approximately 12 ounces of water in the full bottle.
So, Devika estimated that she poured out about 35% of the water in the full bottle, which corresponds to approximately 4.2 ounces.
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In the funtion f(x)=1/x which of these could be a value of f(x) when x is close to zero
In the function f(x) = 1/x, when x is close to zero, the value of f(x) approaches positive or negative infinity. As x approaches zero from the positive side (x → 0+).
The function f(x) = 1/x becomes increasingly large and approaches positive infinity. This is because dividing a positive number by a very small positive number yields a very large positive result.
On the other hand, as x approaches zero from the negative side (x → 0-), the function f(x) = 1/x also becomes increasingly large but in the negative direction, approaching negative infinity. Dividing a negative number by a very small negative number yields a very large negative result.
However, it is important to note that the function f(x) = 1/x is undefined at x = 0 since division by zero is undefined in mathematics. Therefore, we say that the function has a vertical asymptote at x = 0, meaning that the function gets arbitrarily close to positive or negative infinity as x approaches zero, but it never actually reaches zero. In conclusion, when x is close to zero in the function f(x) = 1/x, the value of f(x) could be positive or negative infinity depending on whether x approaches zero from the positive or negative side, respectively.
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Select all the expressions that represent a 20% discount off the price of an item that originally costs d dollars
The expressions that represent a 20% discount off the price of an item that originally costs d dollars are A. 0.8d and C. d-0.2d.
How to find the expressions ?A 20% discount off the original price means that the discounted price is equal to 80% (100% - 20%) of the original price. Therefore, we can calculate the discounted price by multiplying the original price (d) by 0.8 (representing 80%).
Expression A (0.8d) represents the discounted price as 80% of the original price (d), so it is correct. Expression C, d-0.2d" represents a 20% discount off the price of an item that originally costs d dollars.
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Full question is:
Select all the expressions below which represent a 20% discount off the price of an item that originally costs d dollars.
A. 0.8d
B. d-0.2
C. d-0.2d
D. 1-0.2d
The following shape has 1 pair of parallel sidesWhat is the area of the shape?
It is not possible to determine the area of the shape from the given information as the measurements of the sides and angles are not provided.
However, we can identify the shape as a trapezoid because it has one pair of parallel sides. A trapezoid is a quadrilateral with one pair of parallel sides. To calculate the area of a trapezoid, we can use the formula:Area of trapezoid = 1/2 × (sum of parallel sides) × (distance between parallel sides)If we have the measurements of the parallel sides and the distance between them, we can substitute them into the formula to find the area of the trapezoid.
If the measurements are not provided, we cannot find the area of the trapezoid. Thus, it is not possible to determine the area of the shape from the given information, which only tells us that it has one pair of parallel sides.
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The given figure has only one pair of parallel sides. The opposite sides of the trapezium are not parallel. The formula to calculate the area of the trapezium is given as:
A = (a+b)/2 * h, where 'a' and 'b' are the parallel sides of the trapezium and 'h' is the distance between these parallel sides.
We can clearly see that the parallel sides 'a' and 'b' are 6 cm and 10 cm, respectively, and the height 'h' of the trapezium is 4 cm.
Therefore, substituting these values in the above formula, we have:
A = (6 + 10)/2 * 4A = 16/2 * 4A = 8 * 4A
= 32The area of the trapezium is 32 sq cm.
Thus, the area of the given shape is 32 square centimeters.
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How many moles of aluminum oxide are needed to react with fluorine to produce 12. 52 moles of aluminum fluoride?
mol Al2O3
Given,Number of moles of Aluminum fluoride = 12.52 mol AlF3The chemical equation of the reaction between aluminum oxide and fluorine is given by;
2Al2O3 + 6F2 → 4AlF3 + 3O2From the balanced equation above; 2 moles of Al2O3 will produce 4 moles of AlF3Hence, 1 mole of Al2O3 will produce 4/2 = 2 moles of AlF3Number of moles of Aluminum oxide needed to react with fluorine to produce 12.52 moles of aluminum fluoride = 12.52/2 = 6.26 moles Therefore, more than 250 moles of aluminum oxide are needed to react with fluorine to produce 12.52 moles of aluminum fluoride.
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Un arquitecto diseña el arco principal de la nave de una iglesia en forma de una semicircunferencia (180°), con un radio de 2.5m ¿Qué longitud debe tener ese arco a construir?
Based on the above, the length of the arch should be approximately 7.85 meters.
What is the arch?To know the length of the arch, one need to calculate the circumference of the semicircle.
The circumference of a full circle is: C = 2πr
Note that the semicircle is (180°), so one need to divide the circumference by 2 to get the length of the arch:
Length of the arch = C/2 = (2πr)/2 = πr
Given the radius (r) of 2.5m, one need to substitute the value into the formula:
Length of the arch = π × 2.5
= 3.14 × 2.5
=7.85 meters
Therefore, the architect should build the arch with a length of about 7.85 meters.
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An architect designs the main arch of the nave of a church in the shape of a semicircle (180°), with a radius of 2.5m. How long should that arch be built?
Las aspas de un ventilador de techo están girando alrededor de un eje fijo estas parten del reposo con aceleración angular constante en un tiempo están girando 10 revoluciones por segundo y dan 60 vueltas después Irán a 15 revoluciones por segundo
The question provides that the blades of a ceiling fan rotate around a fixed axis and begin to rotate with a constant angular acceleration such that they are rotating at 10 revolutions per second after a certain period of time.
After 60 turns, the fan will be rotating at 15 revolutions per second.
Solution:The given data is:Initial angular speed, ω₁ = 0 (since they start from rest)
Final angular speed, ω₂ = 15 revolutions/sec
Angular acceleration, α = constant
Number of revolutions for the first part, n₁ = 60
Number of revolutions for the second part, n₂ = (total revolutions) - (n₁) = (60 + 10) - 60 = 10 revolutions
Using the formula for the angular velocity, ω = ω₀ + αt
and the formula for the number of revolutions, n = ωt / 2π
We can find out the time required to reach a final speed of 15 rev/s as follows:15 = 0 + αt ⇒ t = 15 / α
The total time required to reach a speed of 15 rev/s would be the sum of the time required to reach a speed of 10 rev/s and the time required to reach 15 rev/s.t = t₁ + t₂ ⇒ t₂ = t - t₁
We can find the value of t₁ from the formula for the number of revolutions during the first part of the motion as follows:n₁ = ω₁t₁ / 2π0 = αt₁² / 2 + ω₁t₁ / 2π ⇒ t₁ = 0
Using the formula for the number of revolutions, we can find the value of t₂ as follows:n₂ = (ω₁t₂ + 1/2 αt₂²) / 2π ⇒ t₂ = 20/α
The value of α can be found by equating the two formulas for t₂ obtained above:
20/α = 15 / α + t₁⇒ α = 100 / 3 rad/s²
We can now substitute this value in the formulas for t and t₂ to find the times required to reach speeds of 10 and 15 rev/s respectively.t₁ = 0 s, t₂ = 60 / 3 = 20 s
Answer: The time required for the blades of the ceiling fan to rotate with a constant angular acceleration before rotating at 10 revolutions per second is 0 seconds and the time required to reach a speed of 15 revolutions per second is 20 seconds.
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