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3 years ago

If I had a board that was 11 1/2 feet long and wanted to give it to 7 boys in equal pieces how long would each piece be?

1 answer:

7 0

11.5 divided by 7.5 = 1.6429, don't know what you are rounding the answer to, but each boy receives about 1.64 feet of the board.

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Find the median of the following numbers. 14, 17, 21, 28, 40.

Elis [28]

Answer:21

Step-by-step explanation: The median is the number in the middle sorted from least to greatest, here 21 is the middle number.

4 0

4 years ago

Read 2 more answers

Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the po

vfiekz [6]

Answer:

b. 224

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.58$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem:

We want to find n, when $M = 0.5, \sigma = 2.9$ So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.5 = 2.58*\frac{2.9}{\sqrt{n}}$

$0.5\sqrt{n} = 7.482$

$\sqrt{n} = 14.964$

$(\sqrt{n})^{2} = (14.964)^{2}$

$n = 223.9$

The nearest integer number to 223.9 is 224.

So the correct answer is:

b. 224

6 0

3 years ago

A sandwich costs 4.00$, a salad costs 2.75$ and drinks cost 1.25$ there is also a delivery fee of 3$.The expression 4n+ 2.75n +

zaharov [31]

Answer:

the answer is 45

Step-by-step explanation:

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4 years ago

If the four lines are extended, which system would have only one solution?

xeze [42]

Answer:

A line a and line b

Step-by-step explanation:

Lines b and c are parallel (no intersection points), so the system will have no solutions.

Lines b and d are parallel (no intersection points), so the system will have no solutions.

Lines c and d coincide (infinitely many intersection points), so the system will have infinitely many solutions.

Lines a and b will intersect after extension, so the system of these two equations will have only one solution.

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4 years ago

4x^2+12x-8 <br>Can you find the get?

nata0808 [166]

Answer:

4(x^2+3x-2)

Step-by-step explanation:

This is the equation factored!

8 0

3 years ago