If one ruler and three pencils cost N120 and two
rulers and one pencil cost N140. Find the cost of
one ruler and one pencil

Answers

Answer 1

Answer:

N80

Step-by-step explanation:

One ruler is N60 and one pencil is N20.


Related Questions

Calculate the product below and give your answer in scientific notation.
(3.3 x 10-4) (8.0 x 109) = ?
Show Calculator

Answers

Answer:

25288

Step-by-step explanation:

shown in the picture

A political party wishes to estimate the proportion of voters that support the party in a particular state. The party will poll a random sample of n voters from the state. Which of the following is likely to result in the largest margin of error?

a. n = 500, confidence level 95%
b. n = 500, confidence level = 99%
c. n = 500, confidence level = 90%
d. n= 300, confidence level 95%
e. n = 300, confidence level = 90%

Answers

Answer:

Option D

Step-by-step explanation:

Generally the equation for Margin of Error is mathematically given by

[tex]M.E=Z*sqrt{\frac{p*(1-p)}{n}}[/tex]

Condition for Largest M.E

n has to be smallest and Z value has to be largest.

Where

From options

Smallest [tex]n=300[/tex]

Largest Z value respects to [tex]\alpha=95\%[/tex]

Therefore

n= 300, confidence level 95%

Option D

PLEASE HELPPPPPPP #1

Answers

Answer:

is the second answer 2x+1/x-1

The time for a visitor to read health instructions on a Web site is approximately normally distributed with a mean of 10 minutes and a standard deviation of 2 minutes. Suppose 64 visitors independently view the site. Determine the following: a. The expected value and the variance of the mean time of the visitors. b. The probability that the mean time of the visitors is within 15 seconds of 10 minutes c. The value exceeded by the mean time of the visitors with probability 0.01.

Answers

Answer:

a) The mean is 10 and the variance is 0.0625.

b) 0.6826 = 68.26% probability that the mean time of the visitors is within 15 seconds of 10 minutes.

c) 10.58 minutes.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Normally distributed with a mean of 10 minutes and a standard deviation of 2 minutes.

This means that [tex]\mu = 10, \sigma = 2[/tex]

Suppose 64 visitors independently view the site.

This means that [tex]n = 64,  = \frac{2}{\sqrt{64}} = 0.25[/tex]

a. The expected value and the variance of the mean time of the visitors.

Using the Central Limit Theorem, mean of 10 and variance of (0.25)^2 = 0.0625.

b. The probability that the mean time of the visitors is within 15 seconds of 10 minutes.

15 seconds = 15/60 = 0.25 minutes, so between 9.75 and 10.25 seconds, which is the p-value of Z when X = 10.25 subtracted by the p-value of Z when X = 9.75.

X = 10.25

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

By the Central Limit Theorem

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{10.25 - 10}{0.25}[/tex]

[tex]Z = 1[/tex]

[tex]Z = 1[/tex] has a p-value of 0.8413.

X = 9.75

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{9.75 - 10}{0.25}[/tex]

[tex]Z = -1[/tex]

[tex]Z = -1[/tex] has a p-value of 0.1587.

0.8413 - 0.1587 = 0.6826.

0.6826 = 68.26% probability that the mean time of the visitors is within 15 seconds of 10 minutes.

c. The value exceeded by the mean time of the visitors with probability 0.01.

The 100 - 1 = 99th percentile, which is X when Z has a p-value of 0.99, so X when Z = 2.327.

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]2.327 = \frac{X - 10}{0.25}[/tex]

[tex]X - 10 = 2.327*0.25[/tex]

[tex]X = 10.58[/tex]

So 10.58 minutes.

Pls help with this question. No links.

Answers

Answer:

i hope it's helpful for you

Define percent in terms of ratios

Answers

Percent is a ratio where we compare numbers to 100 which means that 1% is 1 divide by 100

I need help ASAP please no links

Answers

Answer: D' = (1, -1)

Step-by-step explanation:

When dilating by a 1/2 you take a point and divide the x and y of the point in half. So D before is (2,-2) and then divide that by a 1/2, which gives us our answer (1, -1).

Please helppppppppp!!!!

Answers

Terminal point for 4π/3

(cos4π/3 ,sin4π/3)

{cos(π+π/3) ,sin(π+π/3)}= (-cosπ/3 ,-sinπ/3)

or ,(- 1/2, -√3/2)

OPTION C

Write 2^60 the expression as a exponent with the base of 4

Answers

Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

[tex]2^{60} =2^{2 \times 30} =(2^{2} )^{30}=4^{30}[/tex]

There is a 60% probability that a home in the United States has a large-screen TV. In a sample of six homes, what is the probability that there will be a large screen TV in:_________a). All 6 homes? b). None of the homes c). At least 5 of the homes? d). At most 2 of the homes? e). More than 3 of the homes? f). Less than 3 of the homes? g). How many homes would you expect to have a large-screen TV in a sample of six homes?

Answers

Answer:

faster and smarter Homes its b

Step-by-step explanation:

I did this one

A consistent system of equations is a system with __________.



Select one:

a. the same line

b. parallel lines

c. intersecting lines and lines that have the same slope

d. intersecting lines and lines that have the same equation

Answers

the answer is d. my shlime

The answer is D: intersecting lines and lines that have the same equation

22
20
14
22
29
20
Mean
Mode
Medium
Range

Answers

Mean: To find the mean, we need to add up all of our numbers and divide by the amount added. Adding 22, 20, 14, 22, 29, 20 gives us 127. Then, we divide by 6. This gives us 21.166… or 21.13 rounded.
Mode: The mode is the number that appears the most often. Our numbers are 22, 20, 14, 22, 29, and 20. 22 appears 2 times, 20 appears 2 times, 14 appears 1 time, and 28 appears 1 time. Therefore, the mode is 22 and 20.
Medium/median: I am assuming you meant median, the median is the middle number when the list is sorted from least to greatest. This means our list is 14, 20, 20, 22, 22, 29. We can find the median by crossing out the outer numbers and so on until we reach the middle. 14 and 29 are crossed out. 20 and 22 are crossed out. This gives us 22 as the median.
Range: The range is the difference between the greatest and the least number in our list. The greatest number in our list is 29. The number of the least value is 14. 29-14 is 15. 15 is our range.

Answer:

mean=21.17

mode=20,22

median=3.5

range=15

Step-by-step explanation: MEAN=sum of all observations/ no. of observations

mean=22+20+14+22+29+20/6

mean=127/6

mean=21.17

MODE= most frequent observations

mode=22,20

MEDIAN=1/2(n/2+n+2/2)

=1/2(6/2+6+2/2)

=1/2(3+4)

=1/2(7)

=7/2

=3.5

RANGE=X max -X min

=29-14

=15

Find f(0) and then find the equation of the given linear function.
x 1 2 3 4
f(x) 6 10 14 18
f(0) =

f(x) =

Answers

Answer:

f(0) = 2

f(x) = 4x + 2

Step-by-step explanation:

You can see that the consecutive x-values are producing y-values that increase by 4 each time. Since the change in y is the same every time, we know this is a linear graph because in a continuous linear graph the slope does not change.

We can use the equation for a line: y = mx + b,

where m is the slope and b is the y-intercept.

The slope [m] is calculated by [change in y]/[change in x]. The y-values are increasing by 4 each time x increases by 1. m = 4/1 = 4.

Once we have found the slope, we can find the value for f(0). The line graph has a positive slope, so to find the value at x=0, we would subtract 4, moving backwards along the line.

6-4 = 2

The y-intercept on a line is the y-value for which x = 0. In this case we have already solved for the y-intercept, f(0) = 2.

Now plug the values into the formula.

y = mx + b

The value of f(0) is 2.

The equation of this linear function is y = 4x + 2

What is a function?

A function is defined as a relation between a set of inputs having one output each.

The inputs are called domain of the function.

The outputs are called the range of the function.

We have,

x = 1, 2, 3, 4

f(x) = 6, 10, 14, 18

The f(x) values are the values we get when we substitute x values.

There is a difference of 4 in the f(x) values.

10 - 6 = 4

14 - 10 = 4

18 - 14 = 4

Since the difference between the values of f(x) is same, the given function is a linear function.

The equation of this linear function will be in the form of:

y = mx + c

m = slope

c = y-intercept

Find m.

Choose any two points as: (1, 6) and (2, 10)

m = 10-6 / 2-1 = 4/1= 4

Find c.

x = 0 in y-intercept and choosing any point = (1, 6)

So,

6 = 4 + c

c = 6 - 4 = 2

Now,

The equation of this linear function:

y = 4x + 2

f(0) = 4 x 0 + 2 = 0 + 2 = 2

Thus,

The value of f(0) is 2.

The equation of this linear function is y = 4x + 2

Learn more about functions here:

brainly.com/question/17440903

#SPJ2

Reasoning by induction

Question 1 options:

1)

develops a general conclusion based on observations of cases.


2)

develops a general conclusion based on given information.


3)

starts with assumptions that are known to be valid to draw another new truths.


4)

uses patterns to create logical proofs.

Answers

Answer:

1because the occasion of cases

One of the problems encountered by corporations in America is finding an adequate number of employees who want to move into management. Recent surveys of workers in America taken by the Department of Labor in Washington D. C. revealed that only 20% of employees would like to move into management and be the boss. Suppose that a random sample of 75 U.S. workers was taken and each person was asked whether or not they would like to move into management. Find the probability that at least 18 of the 75 sampled employees would like to move into management.

Answers

Answer:

0.2358 = 23.58% probability that at least 18 of the 75 sampled employees would like to move into management.

Step-by-step explanation:

Binomial probability distribution

Probability of exactly x successes on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

[tex]E(X) = np[/tex]

The standard deviation of the binomial distribution is:

[tex]\sqrt{V(X)} = \sqrt{np(1-p)}[/tex]

Normal probability distribution

Problems of normally distributed distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that [tex]\mu = E(X)[/tex], [tex]\sigma = \sqrt{V(X)}[/tex].

20% of employees would like to move into management and be the boss.

This means that [tex]p  = 0.2[/tex]

Sample of 75:

This means that [tex]n = 75[/tex]

Mean and standard deviation:

[tex]\mu = E(X) = np = 75(0.2) = 15[/tex]

[tex]\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{75*0.2*0.8} = 3.4641[/tex]

Find the probability that at least 18 of the 75 sampled employees would like to move into management.

Using continuity correction, this is [tex]P(X \geq 18 - 0.5) = P(X \geq 17.5)[/tex], which is 1 subtracted by the p-value of X = 17.5. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{17.5 - 15}{3.4641}[/tex]

[tex]Z = 0.72[/tex]

[tex]Z = 0.72[/tex] has a p-value of 0.7642.

1 - 0.7642 = 0.2358

0.2358 = 23.58% probability that at least 18 of the 75 sampled employees would like to move into management.

The product of two numbers is 50 and there sum is 15. Find the number.

Answers

Answer: the numbers are 10 and 5

Step-by-step explanation:

10 times 5 is 50

10 plus 5 is 15

The two numbers are 10 and 5 because 10 times 5 is 50.and 10 plus 5 is 15

AABC-AXYZ. What's the scale factor from
AABC to AXYZ?

Answers

9514 1404 393

Answer:

  (d)  1/4

Step-by-step explanation:

The scale factor is the ratio of lengths of corresponding sides:

  XZ/AC = 3/12 = 1/4

_____

Additional comment

I find the wording of the question a bit ambiguous. To transform ΔABC to ΔXYZ, every linear dimension of ΔABC is multiplied by 1/4. This is the sense of "ΔABC to ΔXYZ" that is used in the above answer.

On the other hand, one of the ways ratios are written is using the word "to," as in "12 to 3". Using this idea, we might interpret the question to be asking for ...

  ΔABC to ΔXYZ = AC to XZ = 12 to 3 = 12/3 = 4

Describe the system of equations
How many solutions does this system have.

Answers

Answer:

Step-by-step explanation:

One solution, at the point of intersection, (3,3)

if the lines 3x+2ky=0 and 2x+5y+1=0 are parallel, then what is the value of k?​

Answers

Answer:

k = 15/4

Step-by-step explanation:

Slope of a line = -a/b

slope of the first line = -3/2k

slope of the second line = -2/5

the slope of two parallel lines are congruent

-3/2k = -2/5

-15 = -4K

k = 15/4

Please help below with prob Stats

Answers

Answer:

te qif y btubf

Step-by-step explanation:

Please help asap please

Answers

Answer:

12.9 miles

Step-by-step explanation:

Formula: (x/360)×dπ(circumference)

90/360=1/4

1/4×16.4π

1/4×51.496

12.874

Answer:

[tex]m JM=90 =\Theta[/tex]

[tex]Radius=dimeter/2=16.4/2[/tex]

[tex]\longrightarrowr=8.2[/tex]

The length of arc JM=

[tex]=\frac{\Theta }{360} \times\pi r[/tex]

[tex]=\frac{90}{360} \times2\times\ 3.14\times 8.2[/tex]

[tex]=12.874[/tex]

[tex]\approx 12.9 \; miles[/tex]

[tex]OAmalOHopeO[/tex]

Consider the phrase "the sum of 3 times a number and the quotient of the number and 4." Let’s break it down. You want the sum of two values. The first value is 3 times a number. What expression represents 3 times a number?

Answers

9514 1404 393

Answer:

  3x

Step-by-step explanation:

If x represents the number, then "3 times a number" is 3x.

__

Additional comment

"The quotient of the number and 4" is x/4.

The sum of those two expressions is ...

  3x + x/4

construct an angle that bisect 90°​

Answers

Answer:

We can construct a 90º angle either by bisecting a straight angle or using the following steps.

Step 1: Draw the arm PA.

Step 2: Place the point of the compass at P and draw an arc that cuts the arm at Q.

Step 3: Place the point of the compass at Q and draw an arc of radius PQ that cuts the arc drawn in Step 2 at R.

Step-by-step explanation:

calculate the resistance if V = 220V and I = 3.6amp​

Answers

Step-by-step explanation:

V= IR --> R = V/I = (220 V)/(3.6 A) = 61.1 ohms

Answer:

61.11 ohms

Step-by-step explanation:

R=V/I

R=220/3.6

R=61.11 ohms

Determine the probability of landing on tails at most 33 times if you flip a fair coin 80 times. Round your answer to the nearest tenth.

Answers

Answer:

0.0728177272

Step-by-step explanation:

Given :

Number of flips = 80

Probability of landing on tail at most 33 times ;

Probability of landing on tail on any given flip = 1 / 2 = 0.5

This a binomial probability problem:

Hence ;

P(x ≤ 33) = p(x=0) + p(x=1) +... + p(x = 33)

Using a binomial probability calculator :

P(x ≤ 33) = 0.0728177272

Two complex numbers have a sum of 14 and a product of 74. Write either of the two numbers.

Answers

Answer:

Hello,

Step-by-step explanation:

The 2 numbers are roots of the equation:

U²-14U+74=0

Discriminant=14²-4*74=-100

U=7-5i or U=7+5i

9514 1404 393

Answer:

  7 +5i   or   7 -5i

Step-by-step explanation:

If the two numbers are represented by x and y, then ...

  x+y = 14

  xy = 74

Substituting for y, we have ...

  x(14 -x) = 74

  x^2 -14x +49 = -74 +49 . . . . . multiply by -1, complete the square

  (x -7)^2 = -25 . . . . . . . . . . . write as a square

  x -7 = ±√(-25) = ±5i . . . . take the square root

  x = 7 ± 5i . . . . . . . . . . . add 7

One of the numbers is 7 +5i.

Based on this example, make a
generalization about the acute angles
formed when two parallel lines are
cut by a transversal.

Answers

Answer:

Step-by-step explanation:

There are 4 of them (acute angles that is)Those 4 are less than 90 degrees.They have supplementary angles which are greater than 90 degrees.There are 4 of them also.The total number of angles should be 8 if there are 2 parallel lines and 1 transversal.

PLS
Write the equation of the piecewise function that is represented by its graph.

IS IT A, B, C, OR D

Answers

9514 1404 393

Answer:

  a) domain bounds are -1 ≤ x ≤ 1, x > 1

Step-by-step explanation:

In considering the definition of any piecewise function, the domain descriptions in the function definition must match the pieces shown in the graph.

Here, the right segment has no upper bound, so x > 1 is an appropriate description of its domain.

The left segment has the points at x=-1 and x=1 included, so the appropriate domain description for that is -1 ≤ x ≤ 1.

The one answer choice that combines these domain descriptions is ...

  [tex]\displaystyle f(x)=\begin{cases}x^2,&\text{if }-\!1\le x\le1\\\sqrt{x},&\text{if }x>1\end{cases}[/tex]


The population, P(t), in millions, of a country, in year t, is given by the formula P(t) = 24 + 0.4t. What are the values of the population for t = 10, 20,
and 30?

Answers

Answer:

B. 28, 32, 36 millions

Step-by-step explanation:

Given:

P(t) = 24 + 0.4t

Where,

P(t) = population in millions

t = number of years

✔️Value of the population when t = 10:

Plug in t = 10 into P(t) = 24 + 0.4t

P(t) = 24 + 0.4(10)

P(t) = 24 + 4

P(t) = 28 million

✔️Value of the population when t = 20:

Plug in t = 20 into P(t) = 24 + 0.4t

P(t) = 24 + 0.4(20)

P(t) = 24 + 8

P(t) = 32 million

✔️Value of the population when t = 30:

Plug in t = 30 into P(t) = 24 + 0.4t

P(t) = 24 + 0.4(30)

P(t) = 24 + 12

P(t) = 36 million

Last year Diana sold 800 necklaces. This year she sold 1080 necklaces. what is the percentage increase of necklaces she sold?

Answers

Answer:

13.5% is the increase in percentage

Answer:

74%

Step-by-step explanation:

To get the answer, divide 800 by 1080, and you will get a decimal. That decimal is 0.74074074074. Then, move the decimal point two times two the right, so you should have 074.074074074. Ignore everything after the decimal point as well as the 0 before the decimal point, and if done correctly, it should be 74%.

So, the final answer would be 74%.

Hope this helped!

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