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3 years ago

Whats the answer for -7x -3x+2= -8x-8

Mathematics

2 answers:

zhannawk [14.2K]3 years ago

6 0

X=5

Add all the Xs together, then get it alone and there’s your anwser

Hope it helps ❤️

Elenna [48]3 years ago

5 0

$-10x+2=-8x-8$ Combine Like Terms

$-2x+2=-8$ Add $-8x$ on both sides

$-2x=-10$ Subtract $2$ on both side

$x=5$ Divide $-2$ to $-10$

*(Answer)*= $x=5$

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The sum of the measures of the interior angles of a triangle is equal to _____. A. 90 B. 180 C. 270 D.360

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4 years ago

The correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. Suppose we use the height x

Andrew [12]

Answer:

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

The value of r is always between $-1 \leq r \leq 1$

And we have another measure related to the correlation coefficient called the R square and this value measures the % of variance explained between the two variables of interest, and for this case we have:

$r^2 = 0.8^2 = 0.64$

So then the best conclusion for this case would be:

c. the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64.

Step-by-step explanation:

For this case we know that the correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. And we know that we use the height x of a child to predict the weight y of the child

We need to rememeber that the correlation is a measure of dispersion of the data and is given by this formula:

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

The value of r is always between $-1 \leq r \leq 1$

$r^2 = 0.8^2 = 0.64$

So then the best conclusion for this case would be:

c. the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64.

3 0

3 years ago

5 1/2 - 3/8 Enter your answer as a mixed number in its simplest form Pweeese

juin [17]

5 1/2 - 3/8

Make 5 1/2 into a improper fraction

5 1/2=11/2. Mutiply the whole number with the denominator. 5*2= 10. Add 10 with the numerator. 10+1= 11

11/2-3/8.

Find the common denominator for 11/2 which is 8. Mutiply by 4

11(4)/2(4)= 44/8

44/8-3/8= 41/8= 5 1/8

Answer: 41/8 or 5 1/8

5 0

4 years ago

How can knowing 4 times 7 help find the product of 8 times 7.

Nadya [2.5K]

Because 4x2 = 8, so 4x7=28, then you times 28 by 2 which equals 56 and 8x7=56

7 0

4 years ago

Read 2 more answers