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3 years ago

Cory's average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

1 answer:

3 0

You should be able to multiply 91 by 8 to get the sum of the first 8 tests, then add the score on the 9th test. Then to get the average of the sum of the 9 tests you need to divide it by 9.
((91*8)+78)/9=89.555555555555.... So, 90%

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Which explains whether or not the function represents a direct variation?

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The function represents a direct variation

Step-by-step explanation:

we know that

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In a linear direct variation the line passes through the origin and the constant of proportionality k is equal to the slope m

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Find the value of k------> substitute the value of x and y

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$C(4,20)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=20/4=5$

$D(6,30)$

Find the value of k------> substitute the value of x and y

$y/x=k$ -----> $k=30/6=5$

$E(8,40)$

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$y/x=k$ -----> $k=40/8=5$

The value of k is equal in all the points of the table and the line passes through the origin

therefore

The function represents a direct variation

the equation of the direct variation is equal to

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