1.


Find the area of the quarter circle with a radius of 18 cm.


Use 3. 14 for it and round the answer to the nearest hundredth.


18cm


The area of the quarter-circle is


cm²

To find the probability that a randomly selected student got an A in math or art class (or both), we need to use the principle of inclusion-exclusion.

Let's define the events:

M = Getting an A in math class

A = Getting an A in art class

We are given the following information:

n(M) = 82 (number of students who got an A in math)

n(A) = 73 (number of students who got an A in art)

n(M ∩ A) = 42 (number of students who got an A in both math and art)

To calculate the probability of getting an A in math or art class (or both), we can use the formula:

P(M ∪ A) = P(M) + P(A) - P(M ∩ A)

We need to find the probabilities P(M) and P(A) first.

P(M) = n(M) / total number of students

P(M) = 82 / 500

P(M) = 0.164

P(A) = n(A) / total number of students

P(A) = 73 / 500

P(A) = 0.146

Now, we can calculate the probability of getting an A in math or art class (or both):

P(M ∪ A) = P(M) + P(A) - P(M ∩ A)

P(M ∪ A) = 0.164 + 0.146 - (42 / 500)

P(M ∪ A) ≈ 0.164 + 0.146 - 0.084

P(M ∪ A) ≈ 0.226

Therefore, the probability that a randomly selected student got an A in math or art class (or both) is approximately 0.226, or 22.6%.

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The measure of angle Y is approximately equal to 117.11 degrees. Therefore, m∠Y = 117.11°.

Given that a triangle ΔXYZ has the sides XY = 6.32, YZ = 5.83, and XZ = 11.05, we need to find the measure of angle Y.

Let's use the cosine law which states that c² = a² + b² - 2abcosC

where a, b, and c are the sides and C is the angle between the sides a and b.

Applying the cosine law to triangle ΔXYZ and substituting the given values, we have:

11.05² = 6.32² + 5.83² - 2(6.32)(5.83)cos Y

cos Y = (6.32² + 5.83² - 11.05²) / (2(6.32)(5.83))

cos Y ≈ -0.4151

Taking the inverse cosine on both sides, we get:

m∠Y = cos⁻¹(-0.4151)

m∠Y = 117.11°

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Solving a product, we can see that Lorena must pay a total of $5.88

We know taht each kilogram of bananas costs $4.70, and Lorena bought a total of 1 and 1/4 kilograms, then to find the cost we just need to solve the following product:

C = (1 + 1/4)*$4.70

We can distribute it to get:

C = $4.70 + $4.70/4

C = $4.70 + $1.18

C = $5.88

That is the total amount that Lorena must pay.

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"complete question.

Lorena fue al supermercado y compró 1 1/4 de plátanos, cuyo kilogramo cuesta $4. 70.

¿Cuánto debe pagar?"

In the given rhombus ABCD, where angle EDA is 37º, we can determine the measures of angle AED, angle DAE, and angle BCE. Angle AED is equal to 180º minus twice angle EDA, which gives us 106º. Angle DAE is equal to angle EDA, so it is 37º. Angle BCE is equal to angle AED divided by 2, resulting in 53º.

A rhombus is a parallelogram with all four sides equal in length. Since ABCD is a rhombus, all four angles are equal, denoted by m<ABC = m<BCD = m<CDA = m<DAB.

We are given that angle EDA is 37º. In a rhombus, opposite angles are congruent, so we have m<CDA = 37º.

To find the measure of angle AED, we use the fact that the sum of angles around a point is 360º. Since angle AED is an exterior angle to triangle CDA, we can write: m<AED + m<CDA + m<DAE = 360º. Substituting the given values, we have: m<AED + 37º + m<DAE = 360º. Rearranging the equation, we find: m<AED + m<DAE = 360º - 37º = 323º.

Since ABCD is a rhombus, opposite angles are congruent, so we have m<DAB = m<CDA = 37º. Therefore, m<DAE = m<DAB = 37º.

Substituting the value of m<DAE in the equation m<AED + m<DAE = 323º, we find: m<AED + 37º = 323º. Solving for m<AED, we get: m<AED = 323º - 37º = 286º.

Finally, to find the measure of angle BCE, we know that opposite angles in a rhombus are congruent, so m<BCD = m<DAB = 37º. Since BCE is an exterior angle to triangle BCD, we can write: m<BCE + m<BCD + m<CBE = 360º. Substituting the given values, we have: m<BCE + 37º + m<CBE = 360º. Rearranging the equation, we find: m<BCE + m<CBE = 360º - 37º = 323º.

Since opposite angles in a rhombus are congruent, m<BCE = m<DAB = 37º. Substituting this value in the equation m<BCE + m<CBE = 323º, we get: 37º + m<CBE = 323º. Solving for m<CBE, we find: m<CBE = 323º - 37º = 286º.

Therefore, the measures of the angles in the given rhombus ABCD are: m<AED = 286º, m<DAE = 37º, and m<BCE = 53º.

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According to the Bible, Nehemiah left Hanani, along with Hananiah the commander of the citadel, in charge of Jerusalem while he traveled. This is mentioned in Nehemiah 7:2, which states:

"Then I put Hanani my brother and Hananiah the commander of the citadel in charge of Jerusalem, for he was a faithful man and feared God more than many."

Nehemiah, a cupbearer to the Persian king Jerusalem, was granted permission to return to Jerusalem to rebuild its walls. During his absence, he entrusted the responsibility of overseeing Jerusalem to Hanani and Hananiah. Hanani is described as Nehemiah's brother and Hananiah as the commander of the citadel, indicating their positions of authority and trustworthiness.

Nehemiah's decision to leave Hanani and Hananiah in charge highlights his confidence in their faithfulness and fear of God, indicating that he believed they would fulfill their duties responsibly during his absence.

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To find the perimeter, we need the lengths of the sides AB, BC, and AC. The area can be calculated using Heron's formula. The measures of the angles can be found using the law of cosines.

Importance of regular exercise

Regular exercise is crucial for maintaining overall health and well-being.

Engaging in regular physical activity offers numerous benefits for both the body and mind. It helps improve cardiovascular health, strengthen muscles and bones, and enhance flexibility. Exercise also plays a key role in weight management, as it helps burn calories and increase metabolism. Furthermore, regular physical activity promotes mental well-being by reducing stress, anxiety, and depression. It can improve cognitive function, boost mood, and enhance sleep quality.

Making exercise a part of your routine is essential for long-term health. Aim for a combination of aerobic exercise, such as jogging or cycling, and strength training exercises, like lifting weights or doing bodyweight exercises. Find activities you enjoy, set realistic goals, and gradually increase the intensity and duration of your workouts.

By incorporating regular exercise into your lifestyle, you can experience improved physical fitness, increased energy levels, better mental health, and a reduced risk of chronic diseases such as heart disease, diabetes, and certain types of cancer. Remember to consult with a healthcare professional before starting any new exercise regimen, especially if you have any underlying health conditions.

Benefits of a balanced diet

Maintaining a balanced diet is essential for optimal health and well-being.

A balanced diet consists of a variety of nutrient-rich foods from different food groups, including fruits, vegetables, whole grains, lean proteins, and healthy fats. These foods provide essential vitamins, minerals, fiber, and antioxidants necessary for the body to function properly.

Consuming a balanced diet offers several benefits. Firstly, it helps maintain a healthy weight and prevents the risk of obesity, which is linked to various health issues like heart disease, diabetes, and certain cancers. A balanced diet also supports proper growth and development in children and adolescents.

Additionally, a balanced diet promotes good digestive health by providing an adequate intake of dietary fiber. It helps regulate bowel movements, prevents constipation, and supports a healthy gut microbiome. Moreover, a balanced diet can enhance immune function, improve energy levels, and promote mental well-being.

To achieve a balanced diet, aim for a variety of colorful fruits and vegetables, whole grains like brown rice and quinoa, lean proteins such as poultry, fish, and legumes, and healthy fats like avocado and olive oil. Limit the intake of processed foods high in added sugars, unhealthy fats, and sodium.

By maintaining a balanced diet, you can enjoy improved overall health, reduced risk of chronic diseases, enhanced energy levels, and better overall well-being. Remember to consult with a registered dietitian or healthcare professional for personalized dietary guidance based on your specific needs and goals.

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Therefore, the dimensions of the parking lot can be 32 m × 24 m or 24 m × 32 m.

Let's represent the dimensions of the rectangular parking lot as 'l' and 'w.' Therefore, the perimeter of the parking lot can be expressed as:Perimeter, P = 2l + 2w

We are given the perimeter of the parking lot as 112.

Therefore,112 = 2l + 2w

Now, let's solve for l in terms of w

112 - 2w = 2l

56 - w = l  

l = 56 - w

Now, let's represent the area of the parking lot as 'A'.A = lw 768 = l w 768 = (56 - w)w768 = 56w - w²0 = w² - 56w + 768 To solve the above quadratic equation, we will use the quadratic formula:

x = (-b ± √(b² - 4ac))/2a

On substituting the given values in the above formula, we get:

w = 24 or w = 32If w = 24, then l = 56 - 24 = 32If w = 32, then l = 56 - 32 = 24

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Felicia's weekend profit is of $17.52 .

Given,

Pet grooming charges for each dog = $15

Cost of dog shampoo and grooming material = $23.76

Now,

Let us assume weekend to be :

Saturday and Sunday.

So,

For Saturday,

Pet grooming charges for each dog = $15

Cost of dog shampoo and grooming material = $23.76

Profit for saturday = $8.76

For sunday,

Pet grooming charges for each dog = $15

Cost of dog shampoo and grooming material = $23.76

Profit for sunday = $8.76

Hence,

Total profit for weekend = 8.76*2

Total profit for weekend = $17.52

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After 21 years, the amount in the account would be approximately $2160 to the nearest dollar.

To find out how much money would be in the account after 21 years, we can use the concept of compound interest.

Given that the money in the account doubles every 9 years, we can calculate the number of doubling periods within 21 years:

Number of doubling periods = 21 years / 9 years = 2.333 (approximately)

Since we can't have a fraction of a doubling period, we need to consider that there are 2 doubling periods within 21 years.

Now, let's calculate the final amount in the account using the formula for compound interest:

Final amount = Initial amount * (1 + interest rate)^(number of doubling periods)

In this case, the initial amount is $540 and the interest rate is 100% because the money doubles. The number of doubling periods is 2.

Final amount = $540 * (1 + 1)^(2)

Final amount = $540 * (2)^2

Final amount = $540 * 4

Final amount = $2160

Therefore, after 21 years, the amount in the account would be approximately $2160 to the nearest dollar.

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The exact number of marbles in the jar is estimated to be around 140-145. Vicki won the contest with the closest estimate of 135 marbles, followed closely by Timothy with 150 marbles and Lyon with 152 marbles. Quinn's estimate of 131 marbles was the farthest from the actual number.

Based on the estimates provided by the contestants, we can infer that the number of marbles in the jar lies somewhere between 131 and 152. Vicki's estimate of 135 marbles was the closest to the actual number, making her the winner of the contest. Timothy's estimate of 150 marbles was also quite close and secured him the second place. Lyon's estimate of 152 marbles came in third, indicating that the actual number may be slightly lower. Lastly, Quinn's estimate of 131 marbles was the furthest from the actual number, implying that the true count exceeds that figure.

Considering the estimates of all the contestants, we can reasonably conclude that the exact number of marbles in the jar falls within the range of 140-145. It is important to note that without additional information or a precise estimation method, it is challenging to determine the exact count. However, based on the given estimates, this range provides a reasonable estimate for the number of marbles in the jar.

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In this situation, Samantha should carefully evaluate her experiment, hypotheses, and data to understand the reasons why her data did not support her hypotheses.

When Samantha's data do not support her hypotheses, it is important for her to approach the situation with a scientific mindset. She should first examine her experimental design and methodology to ensure that they were sound and reliable. Samantha should consider if any procedural errors, biases, or confounding factors may have influenced her results.

Next, Samantha should critically analyze her data to identify any patterns, trends, or inconsistencies. She should explore alternative explanations or factors that might account for the observed outcomes. It is possible that Samantha's initial hypotheses were based on incomplete information or flawed assumptions. By considering different perspectives and potential variables, Samantha can gain a deeper understanding of the phenomena she studied.

Based on her evaluation, Samantha may need to revise her hypotheses, adjust her experimental approach, or even consider pursuing a different research direction. Negative results can still provide valuable insights and contribute to scientific knowledge by ruling out certain explanations or suggesting new avenues for investigation.

Ultimately, Samantha should embrace the opportunity to learn from her experiment and use the experience to refine her scientific approach. The process of questioning, analyzing, and adapting is crucial in advancing scientific understanding.

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It's important to note that when working with percentages, it's crucial to pay attention to the decimal representation of the percentage and apply it correctly to the given value.

To calculate the amount of Tim's gross pay that will be deducted for the Social Security tax, we need to multiply his gross pay by the Social Security tax rate.

The Social Security tax rate is given as 6.2%, which can be written as 0.062 in decimal form.

To find the amount deducted, we multiply the gross pay by the tax rate:

$1568 * 0.062 = $97.216

Now, let's compare this result with the given options:

A. $972.16 - This is not the correct amount. It seems to be a different calculation.

B. $97.22 - This is the correct amount. It matches the result we obtained.

C. $25.29 - This value is significantly lower than the correct amount and does not match our calculation.

D. $6.20 - This value is significantly lower than the correct amount and does not match our calculation.

Based on the comparison, the correct amount of Tim's gross pay that will be deducted for the Social Security tax is $97.22.

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To dilate the points H(-1, -1), A(1, 0), and T(-1, 2) by a scale factor of 2 from the point (-1, 2), So the answer is: the dilated points are H(-3, 3), A(-1, 4), and T(-3, 6) when dilated by a scale factor of 2 from the point (-1, 2).

The following steps are:

1. Calculate the translation vector from (-1, 2) to the origin (0, 0). Subtract the coordinates of the origin from the coordinates of the point (-1, 2):

Translation vector = (-1 - 0, 2 - 0) = (-1, 2).

2. Apply the dilation to each point using the scale factor of 2. Multiply the translation vector by the scale factor:

Dilation vector = Scale factor * Translation vector

= 2 * (-1, 2)

= (-2, 4).

3. Translate the points back to their original position by adding the dilation vector to each point:

Dilated point H: (-1, -1) + (-2, 4) = (-3, 3)

Dilated point A: (1, 0) + (-2, 4) = (-1, 4)

Dilated point T: (-1, 2) + (-2, 4) = (-3, 6)

So, the dilated points are H(-3, 3), A(-1, 4), and T(-3, 6) when dilated by a scale factor of 2 from the point (-1, 2).

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The desired revenue for the buffet can be represented by the inequality (P + x) * C ≥ R, where P is the initial price, x represents $1 increases, C is the average number of customers per hour, and R is the desired revenue.



To represent the restaurant owner's desired revenue, we need to create an inequality in standard form based on the given information. Let's assume the initial price of the buffet is $P, and x represents the number of $1 increases. The new price of the buffet would be P + x.The average number of customers per hour is represented by the variable C. The revenue generated per hour can be calculated by multiplying the price paid by each customer (P + x) and the average number of customers per hour (C). Hence, the hourly revenue can be expressed as (P + x) * C.

To create an inequality representing the desired revenue, we need to set a specific target revenue level. Let's assume the owner desires a minimum revenue of R dollars per hour. The inequality representing the desired revenue can be expressed as:

(P + x) * C ≥ R

This inequality states that the product of the new buffet price (P + x) and the average number of customers per hour (C) must be greater than or equal to the desired revenue (R) to meet the owner's expectations.

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A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 18 is added to the sample, the new mean, can be calculated as 14.

The initial sample of n = 5 scores has a mean of M = 12. To find the new mean after adding a score of X = 18 to the sample, we can use the formula for the mean: M = (sum of scores) / (number of scores).

The sum of the original scores is 5 * 12 = 60. When we add the score of 18, the new sum becomes 60 + 18 = 78. Since the total number of scores is now 6, the new mean is calculated as 78 / 6 = 13.

Therefore, the new mean after adding a score of 18 to the sample is 14.

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 To find the measure of x and the unknown angles in a polygon, we can create an equation based on the sum of the interior angles, which is 540 degrees.final answer is 108°.

Let's assume the polygon has n sides. Each interior angle of a polygon can be calculated using the formula (n - 2) * 180° / n. In this case, we are given that the sum of the interior angles is 540 degrees.
So, we can set up the equation:
(n - 2) * 180° / n * n = 540°
Simplifying the equation:
(n - 2) * 180° = 540°
(n - 2) = 540° / 180°
(n - 2) = 3
Solving for n:
n = 3 + 2
n = 5
Now that we know the polygon has 5 sides, we can find the measure of x by substituting it back into the formula:
x = (5 - 2) * 180° / 5
x = 3 * 180° / 5
x = 540° / 5
x = 108°
In conclusion, the measure of x is 108 degrees, and each of the unknown angles in the polygon would also be 108 degrees since all angles in a regular polygon are equal.

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To calculate your earnings for 5 years, we can use the given information that you will receive a 3% raise each year.

In the first year, your earnings are $38,900. For the subsequent years, we can calculate the raise amount and add it to the previous year's earnings. Year 2: $38,900 + 3% of $38,900, Year 3: (Year 2 earnings) + 3% of (Year 2 earnings), Year 4: (Year 3 earnings) + 3% of (Year 3 earnings), Year 5: (Year 4 earnings) + 3% of (Year 4 earnings). Calculating each year's earnings: Year 2: $38,900 + 0.03 * $38,900,  Year 3: (Year 2 earnings) + 0.03 * (Year 2 earnings),  Year 4: (Year 3 earnings) + 0.03 * (Year 3 earnings), Year 5: (Year 4 earnings) + 0.03 * (Year 4 earnings).

Using these calculations, we find the earnings for each year: Year 1: $38,900,  Year 2: $40,067, Year 3: $41,240,  Year 4: $42,422,  Year 5: $43,613.

Therefore, if you work for the company for 5 years, you will earn approximately $43,613.

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There are a total of 18 different combinations of meals you can order at El Toro Mexican Restaurant by choosing one option each for the main dish (burrito, taco, or enchilada), filling (beef or chicken), and salsa (mild, medium, or hot).

To find the number of combinations, we multiply the number of options for each choice. There are 3 options for the main dish (burrito, taco, or enchilada), 2 options for the filling (beef or chicken), and 3 options for the salsa (mild, medium, or hot).

Thus, the total number of combinations is obtained by multiplying these options together: 3 (main dish) * 2 (filling) * 3 (salsa) = 18. Therefore, there are 18 different combinations of meals you can order at El Toro Mexican Restaurant by selecting one option each for the main dish, filling, and salsa.

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Let's denote the number of spools of Indigo thread as 'x' and the number of spools of orange thread as 'y'. The given information tells us that each Indigo spool is 7 meters long and each orange spool is 5 meters long.

We can set up a system of equations based on the given information:Equation 1: x + y = 4 (since she bought 4 spools in total)Equation 2: 7x + 5y = 28 (since the total length of thread is 28 meters) To solve this system of equations, we can use various methods, such as substitution or elimination. Let's solve it using the substitution method:From Equation 1, we can express x in terms of y as x = 4 - y.Substituting x = 4 - y into Equation 2, we get:

[tex]7(4 - y) + 5y = 28\\28 - 7y + 5y = 28\\-2y = 0\\y = 0[/tex]

Substituting y = 0 back into Equation 1, we find:

[tex]x + 0 = 4\\x = 4[/tex]

Therefore, Strickland bought 4 spools of Indigo thread and 0 spools of orange thread.In summary, Strickland bought 4 rolls of Indigo thread and 0 rolls of orange thread to have a total length of 28 meters

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The correct statement is: c. Gross pay - job expenses = total employment compensation

In the context of calculating total employment compensation, the statement in option c is always true. Gross pay refers to the total amount earned by an employee before any deductions or taxes.

The Job expenses are expenses related to performing the job such as travel expenses or necessary tools/equipment. By subtracting the job expenses from the gross pay, we arrive at the total employment compensation which represents the net amount the employee receives after accounting for the expenses associated with their job.

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Based on the given information, we can expect Jadah's bus to be late for approximately 108 out of the 180 school days.

To determine the expected number of days Jadah's bus would be late out of 180 school days, we can use the proportion of late days from the previous week.

Out of the last 5 days, her bus was late for 3 days. This can be represented as a ratio: 3/5.

To find the expected number of late days out of 180 school days, we can set up a proportion:

(3/5) = x/180

Cross-multiplying, we get:

5x = 3 * 180

5x = 540

x = 540/5

x = 108

Therefore, based on the results from the previous week, we can expect Jadah's bus to be late for approximately 108 out of the 180 school days.

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The required lateral surface area of the sugar cone is approximately 12.60 square inches. Option A is correct.

To find the lateral surface area of the sugar cone, we need to calculate the curved surface area of the cone excluding the base.

Given:

Slant height (l) = 4 inches

Diameter (d) = 2 inches

First, let's find the radius (r) of the cone by dividing the diameter by 2:

r = d/2 = 2/2 = 1 inch

The lateral surface area (A) of the cone can be calculated using the formula:

A = πrl

Substituting the given values:

A = 3.14 * 1 inch * 4 inches

A = 12.56 square inches

Therefore, the lateral surface area of the sugar cone is approximately 12.56 square inches.

Among the given answer choices, the closest option is:

12.6 square inches.

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The table displays the total number of goals scored by Jose and Manuel, two soccer players who have played as center forwards, over the past 10 seasons. The details of their goal-scoring performance are provided in the table.

To provide a comprehensive analysis of the goal-scoring performance of Jose and Manuel over the past 10 seasons, it would be helpful to examine the table. The table likely contains two columns, one for Jose's total goals and another for Manuel's total goals, with each row representing a particular season.

By analyzing the numbers in the table, we can identify patterns, trends, and variations in their goal-scoring performance. We can compare the total goals scored by Jose and Manuel in each season, identify seasons where one player outperformed the other, and calculate the average goals per season for both players. Additionally, we can assess their consistency over time and look for any significant changes or improvements in their goal-scoring abilities.

However, without the specific values presented in the table, it is not possible to provide a detailed analysis of their goal-scoring performance over the 10 seasons.

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additional information to prove that the two triangles have all three corresponding sides and angles congruent. Hence option d is correct.

When we sa that two triangles are congruent, it means that they have all three pairs of corresponding sides and angles that are congruent

t. So, in order to know that the triangles are congruent using the SAS (Side-Angle-Side) method, we need to have additional information to prove that the two triangles have all three corresponding sides and angles congruent.

Option a): OP = OV. This is not sufficient to show congruence between the triangles using the SAS method. The given reason does not provide any angle information.

Option b): RO = TO or OP = OV. This is also not sufficient to show congruence using the SAS method. The given reason provides only two corresponding sides and no angle information.

Option c): RO = TO. This is not sufficient to show congruence using the SAS method. The given reason provides only one pair of corresponding sides and no angle information.

Option d): Angle R = Angle T. This is sufficient to show congruence using the SAS method. This given reason provides one pair of corresponding sides and an included angle that is congruent in both triangles. Thus, the two triangles have two pairs of congruent sides and a congruent angle between them, which satisfies the SAS condition.

From the above analysis, we can conclude that option (d) is the correct answer. To know whether two triangles are congruent using the SAS method, we need to have additional information to prove that the two triangles have all three corresponding sides and angles congruent

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The probability of selecting a red pencil followed by a yellow pencil is 3/182. The probability of choosing a red pencil followed by a yellow pencil is obtained by multiplying the probability of choosing a red pencil and the probability of choosing a yellow pencil without replacing the red pencil.

It is expressed as a fraction, decimal, or percentage. It is computed by dividing the number of possible successful outcomes by the number of total outcomes. The number of pencils in the box is 14.

The probability of choosing a red pencil is 3/14 because there are three red pencils in the box. The likelihood of selecting a red pencil followed by a yellow pencil is the product of these two probabilities:

3/14 × 1/13

= 3/182.

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the lengths of the three sides of the triangle are approximately:

Side one: 4.875 units

Side two: 19.5 units

Side three: 14.625 units

Let's denote the lengths of the sides of the triangle as follows:

Side one: x

Side two: 4x (since it is four times the length of side one)

Side three: 3x (since it is three times the length of side one)

The perimeter of a triangle is the sum of the lengths of all three sides. In this case, the perimeter is given as 39 units. We can set up an equation to solve for x:

x + 4x + 3x = 39

Combining like terms:

8x = 39

Dividing both sides by 8:

x = 39/8

Simplifying the fraction:

x = 4.875

Now, we can find the lengths of all three sides by substituting this value of x back into our expressions for each side:

Side one: x = 4.875 units

Side two: 4x = 4.875 * 4 = 19.5 units

Side three: 3x = 4.875 * 3 = 14.625 units

Therefore, the lengths of the three sides of the triangle are approximately:

Side one: 4.875 units

Side two: 19.5 units

Side three: 14.625 units

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The water level in one part of the river fell at a rate of 1.05 millimeters per year for a duration of 2.48 years. The average annual trend, however, indicates that the water level rises at a rate of 1.8 mm/year.

In Matea's recorded data, the rate at which the water level fell is given as 1.05 millimeters per year. This represents the change in water level over a period of one year. To calculate the total variation in water level, we need to multiply the rate of change by the duration of the observation. In this case, the observation lasted for 2.48 years.

To find the total variation, we multiply the rate of change (1.05 mm/year) by the duration (2.48 years):

Total variation = Rate of change * Duration

= 1.05 mm/year * 2.48 years

= 2.604 mm

Therefore, the water level in that particular part of the river fell by 2.604 millimeters over the course of 2.48 years.

It is important to note that the average annual trend, which indicates the water level rising at a rate of 1.8 mm/year, is not relevant to determining the rate at which the water level fell or calculating the total variation. The average annual trend is simply a reference point for comparison to assess whether the observed variation is consistent with the overall trend.

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Answer:

yo

Step-by-step explanation:

1.     1.05mm/years

2.    2.48 years

To find the approximate length of b in ΔABC, we will use the law of sines. Using the law of sines, we can write:  b / sin B = c / sin C, where B is the angle opposite b and C is the angle opposite c.

We know the value of c, a, and A. Thus, we can find the value of sin C using the sine rule,i.e. c / sin C = 2R, where R is the radius of the circumcircle of ΔABC. The value of sin C can be found as sin C = c / 2R. Now, using the value of sin C, we can write:

b / sin B = c / sin C

b / sin B = c / (c / 2R)

b / sin B = 2R

Therefore, sin B = b / (2R)Now, we can find the value of R by using the formula

R = a / (2 sin A), where A is the angle opposite a. Putting the values in this formula, we get:

R = a / (2 sin A) = (3.3) / (2 sin 20°) = 5.004 units

Now, using the value of R, we can find the value of sin B, i.e. sin B = b / (2R)Using the formula, we get:

sin B = b / (2R)

sin B = b / (2 × 5.004)

sin B = b / 10.008

Therefore, we get: b = 10.008 sin B

Now, we can find the range of values of b by finding the range of values of sin B. The value of sin B can range from 0 to 1. Thus, the value of b can range from 0 to 10.008.

Therefore, the possible approximate lengths of b are between 0 and 10.008 units. Hence, the correct answer 2. 6 units and 6. 6 units.

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The pattern that multiplies each number by 5 starting at 4 and stopping after 5 numbers is:4, 20, 100, 500, 2500.

How to get the solution?

Given that we start at 4, and we are to multiply each number by 5, we have;

4 × 5 = 20

That gives us the second number.

To get the third number, we multiply 20 by 5 again.

20 × 5 = 100

To get the fourth number, we again multiply the third number by 5.

100 × 5 = 500

Finally, we multiply the fourth number by 5 to get the fifth number.500 × 5 = 2500.

Therefore, the pattern that multiplies each number by 5 starting at 4 and stopping after 5 numbers is:4, 20, 100, 500, 2500.

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