Which graph could represent the price of a fence selling at a unit rate of R dollars per foot?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?