3 years ago

Combine like terms.

Mathematics

1 answer:

tamaranim1 [39]3 years ago

3 0

It would be 20-5x because 6x-11x= -5x and 12+8= 20

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The ratio of the side lengths for a triangle is exactly 7:11:13. in a second triangle similar to the first, the shortest side is

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3 years ago

Art and his friends spent $62 at the movies. Admission tickets cost $12 apiece, and a bucket of popcorn costs $7. Which equation

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3 years ago

On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true popu

igor_vitrenko [27]

Answer:

We need at least 4238 scores.

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:

$\alpha = \frac{1-0.97}{2} = 0.015$

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 $1-0.015 = 0.985$ , so $z = 2.17$

Now, find the margin of error M

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

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

How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97 percent confidence in the results

We need at least n scores, in which N is found when $M = 0.5$ . So

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

$0.5 = 2.17*\frac{15}{\sqrt{n}}$

$0.5\sqrt{n} = 2.17*15$

$0.5\sqrt{n} = 32.55$

$\sqrt{n} = \frac{32.55}{0.5}$

$\sqrt{n} = 65.1$

$\sqrt{n}^{2} = (65.1)^{2}$

$n = 4238$

We need at least 4238 scores.

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4 years ago

Is 5 a solution to 2x + 5 = 15? Yes or No<br> How do you know?

dybincka [34]

Answer:

Step-by-step explanation:

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3 years ago

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