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Marat540 [252]
3 years ago
14

Melissa had $24 dollars to spend on school supplies. After buying 10 pens, she had $12.20 left.

Mathematics
2 answers:
vaieri [72.5K]3 years ago
6 0

Answer:

And the question is?

Step-by-step explanation:

Haha, im joking,  It should be 11.8. (Mixed it up)

Leya [2.2K]3 years ago
4 0

Answer: She spent $11.8

Step-by-step explanation:

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Without dividing, select the number that is divisible by 3.
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a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval
il63 [147K]
We cannot calculate the confidence interval without the sample size.  However, for the second question, the sample size needed would be 49.

The formula we use is

n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2

To find the z-score:
Convert 98% to a decimal:  0.98
Subtract from 1:  1-0.98 = 0.02
Divide by 2:  0.02/2 = 0.01
Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49
6 0
3 years ago
Which of the following is an equation of the line that crosses through (-3,4) and (3,6)?
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Answer:

y=(1/3)x+5

Step-by-step explanation:

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y=(1/3)x+b

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6=(1/3)(3)+b

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