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3 years ago

A store is selling blank CDS in packages of 5 do $20. What is the cost of one blank CD?

Mathematics

2 answers:

DochEvi [55]3 years ago

6 0

Answer:

Step-by-step explanation:

5 cds/ $20

divide both sides by 5

1 cd/$4

vovangra [49]3 years ago

3 0

Answer:

Step-by-step explanation:

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Maggie is rock climbing. After reaching the summit, she descends 14 feet in 2 1/3 minutes. If she continues at this rate, where

attashe74 [19]

Steps:
2 1/3 * 3 = 7
14 * 3 = 42
42 divided by 7 = 6
6 * 8 = 48
So, Maggie is 48 feet under the summit (-48). Therefore, the correct answer is d.

4 0

3 years ago

A survey asked whether respondents favored or opposed the death penalty for people convicted of murder. Software shows the resul

scoray [572]

Answer:

The 95% confidence interval for those opposed is: (0.298, 0.334).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

1786 of the 2611 were in favor, so 2611 - 1786 = 825 were opposed. Then

$n = 2611, \pi = \frac{825}{2611} = 0.316$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.316 - 1.96\sqrt{\frac{0.316*0.684}{2611}} = 0.298$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.316 + 1.96\sqrt{\frac{0.316*0.684}{2611}} = 0.334$

The 95% confidence interval for those opposed is: (0.298, 0.334).

4 0

3 years ago

11.4÷35.7 answer estimated<br>(15 points)(brainliest included)<br>(incorrect answer=report)

Gre4nikov [31]

Answer:

0.31932773109

Step-by-step explanation:

Set it up
Move the decimal point one place to the right for both of them
Then, do the long division
Keep adding zeros at the end until you have your answer
You can round it to 0.32 if you want

8 0

3 years ago

Write the expression two cubed times seven as a numerical <br> expression

matrenka [14]

Answer:

dgfyxbjgucjcyffkcuxt fb k gi

3 0

3 years ago

Unit 6 homework 2 need help

kodGreya [7K]

∆PQR and ∆SQT are similar, so corresponding sides occur in fixed ratios with one another. This means

SQ / PQ = ST / PR

Solve for x :

8 / ((x + 5) + 8) = (x - 9) / 21

8 / (x + 13) = (x - 9) / 21

168 = (x - 9) (x + 13)

168 = x² + 4x - 117

x² + 4x - 285 = 0

(x + 19) (x - 15) = 0

⇒ x = -19 or x = 15

But x can't be smaller than 9, otherwise ST = x - 9 would be a negative length. So x = 15.

8 0

2 years ago