What does the 3 represent in 3(20 15)?

Depending on what you're supposed to do, the three could either mean to distribute it into the equation, giving you
either
(3*2015) or (3*20)*(3*15) or (3*20) +/- (3*15)

Or an example of factoring where they took 3 out of 60 and 45.

There are no instruction on what to do in this question.

B.the point lies directly on the regression

How much is 32 out of 40 written as a percentage? convert fraction (ratio) 32 / 40 answer:   80%