What is the answer

Add or subtract polynomial : –12qr? +13rq?

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second