25 pts! Will make brainliest, could someone help me please? TwT

1 = the average of sleep hours would be - h

2 = the average of test scores would be - %

3 = the average of the product of sleep hours and test scores (h×%)

4 = the average of the square of sleep hours (h×h)

a) The equation of your best-fit (least-squared-error) line is then

 % = (a3 - (a1×a2))/(a4 - (a1)²)×(h - a1) + a2

In numbers, this is

 % = 6.33333h + 38.6875

b) In the  h = 8, the equation gives

 838.6875 + 6.33333×8  ≈ 89.4

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this is answer of 144 cubic meters