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Ymorist [56]
2 years ago
9

Chris has a job selling newspapers every morning. He received a base pay of $7.45 a day and also gets 15 cents for every paper h

e sells. One morning he made $16.45. How many papers did he sell?

Mathematics
1 answer:
Varvara68 [4.7K]2 years ago
5 0
16.45-7.45=9
9/0.15=60
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A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level
cupoosta [38]

Answer:

The sample required is  n = 135

Step-by-step explanation:

From the question we are told that

     The  standard deviation is  \sigma = 9

      The margin of error is E =  2

     

Given that the confidence level is  99%  then the level of  significance is mathematically evaluated as

         \alpha =  100-99

        \alpha =  1 \%

        \alpha =  0.01

Next we will obtain the critical value  \frac{\alpha }{2} from the normal distribution table(reference  math dot armstrong dot edu) , the value is  

             Z_{\frac{\alpha }{2} } =  Z_{\frac{0.05 }{2} } =  2.58

The  sample size is mathematically represented as

          n = [ \frac{Z_{\frac{\alpha }{2} } *  \sigma }{E} ]^2

substituting values

           n = [ \frac{ 2.58 *  9 }{2} ]^2

            n = 135

3 0
2 years ago
A particular plant root grows 1.5 inches per month. How many centimeters is the plant root growing per month?
NISA [10]

Answer:3.81 centimeters

Step-by-step explanation:All you have to do is to convert inches into centimeters

So 1 inch=2.54cm

Therefore 1.5inches=(1.5/1)×2.54cm

=3.81cm

3 0
2 years ago
Please Hurry!!
r-ruslan [8.4K]
The answer is B. y = -1/5x +1/2.

EXPLANATION

First solve for the slope:
m = \frac{y2 - y1}{x2 - x1} \\ m = \frac{0 - \frac{3}{5} }{ \frac{1}{2} - \frac{1}{5} } \\ m = - \frac{1}{5}
After finding the slope, look for the linear equation with the same value of m (parallel equation).
4 0
3 years ago
A box is x to inches high,(2x+3)inches wide, and (2x+5) of inches long. In terms of x, what is the volume (v) of the box?
Advocard [28]

Answer:

The volume of the box is V=(4x^3+16x^2+15x)\ in^3

Step-by-step explanation:

we know that

The volume of the box is equal to

V=LWH

where

L is the length of the box in inches

W is the width of the box in inches

H is the height of the box in inches

we have

L=(2x+5)\ in\\W=(2x+3)\ in\\H=x\ in

substitute in the formula

V=(2x+5)(2x+3)x

V=(4x^2+6x+10x+15)(x)

V=(4x^2+16x+15)(x)

V=(4x^3+16x^2+15x)\ in^3

6 0
3 years ago
(Pleave give the CORRECT answer, I will give out brainliest to this correct answer. Don't make up something to get brainliest be
Alex17521 [72]

Answer:

Size 50

Step-by-step explanation:

You should choose the larger sample size.  This is because if you take the mean, it will help to cancel out outliers.  For instance, most people exercise half an hour.  With sample size of 10, there might be one person who doesn't exercise, thus dragging down the mean.  A larger sample size would have a greater ratio of "average" people.

3 0
3 years ago
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