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3 years ago

Use the distributive property to simplify -2.5(-9 q + 16)

Mathematics

1 answer:

olya-2409 [2.1K]3 years ago

5 0

Answer:

Step-by-step explanation:

22.5q - 40

Notice that the number in in front of the q is +. That's because there are two minus signs multiplied and that makes a plus.

There is only 1 minus sign in front of 2.5 * 16 and that makes 40 minus.

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Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

Solution to the problem

And in order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

Let's assume the following data

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n=10 $\sum x = 172, \sum y = 74, \sum xy = 2623, \sum x^2 =6194, \sum y^2 =1118$

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Use the distributive property to simplify -2.5(-9 q + 16) ​

Use the distributive property to simplify -2.5(-9 q + 16)