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3 years ago

Dean is building a tower with blocks as shown in the diagram. The tower shown has three stories

Mathematics

1 answer:

vagabundo [1.1K]3 years ago

4 0

Answer:

Step-by-step explanation:

divide 80 by 3 and then multiply answer by 15

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Wich is corect btw this is homework

Amanda [17]

Answer:68 with the little two

Step-by-step explanation:

5 0

3 years ago

For the graph x = -3 find the slope of a line that is parallel to it.

shutvik [7]

The ilne paralell to x=something is x=something else (both are constants)

slope=rise/run

x=-3
it rises infiniley and runs 0 (goes left to right 0)
slope=infinity/0=undefined

the slope is undefined
paralell lines have same slope
so the slope of a paralell line is also undefined

3 0

3 years ago

Read 2 more answers

I will mark BRAINLIEST!! Please answer ASAP!

Delicious77 [7]

Answer:

1.7 laps per minute

Step-by-step explanation:

8 0

3 years ago

You are planning a survey of starting salaries for recent computer science majors. In a recent survey by the National Associatio

nydimaria [60]

Answer:

A sample size of 554 is needed.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

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.

Standard deviation is known to be $12,000

This means that $\sigma = 12000$

What sample size do you need to have a margin of error equal to $1000, with 95% confidence?

This is n for which M = 1000. So

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

$1000 = 1.96\frac{12000}{\sqrt{n}}$

$1000\sqrt{n} = 1.96*12$

Dividing both sides by 1000:

$\sqrt{n} = 1.96*12$

$(\sqrt{n})^2 = (1.96*12)^2$

$n = 553.2$

Rounding up:

A sample size of 554 is needed.

5 0

3 years ago

Jeremiah wants to use a meter stick to measure the dimensions of a magazine cover to find its area. is that an appropriate measu

kicyunya [14]

A magazine is much smaller than a meter stick. Although it would be possible to measure the dimensions of the magazine using the meter stick, since there are centimeter marking on them, a ruler would be a much more appropriate tool to use because of its similarity in size to the magazine.

8 0

3 years ago