Help!! Khan academy 2020 alg1

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.