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2 years ago

Simply the expression by combining like terms. 9x+8+3x+4=

Mathematics

2 answers:

gayaneshka [121]2 years ago

3 0

Answer:

12(x + 1)

Step-by-step explanation:

9x + 8 + 3x +4

9x + 3x + 8 + 4

12x + 12

12(x + 1)

Vitek1552 [10]2 years ago

3 0

It is 12 I’m pretty sure

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vichka [17]

The answer would be .5 pounds

1 ounce is equal to .0625 lbs

so 8 * .0625 = .5

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3 years ago

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A square pyramid has a base edge of 15 inches. The volume of the pyramid is 960 cubic inches. What is the height of the pyramid,

gizmo_the_mogwai [7]

Answer: h=12.8in

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Step-by-step explanation:

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3 years ago

Find the least common multiple of 3,4,5,6,10,15

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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 $1 - \alpha$ .

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

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:

$\sqrt{n} = 1.96*12$

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Rounding up:

A sample size of 554 is needed.

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2 years ago