HI CAN ANYONE PLS ANSWER DIS MATH PROBLEM

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

What is the area of a pizza with a radius of 40 cm leave the answer in terms of π to find your exact answer 40π cm² 1600π cm² 800π cm² 80π cm² π=pi

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)