(c) A rectangle has its base lying on the x− axis and its upper corners on the parabola y=18−x2. If the upper right corner is (st), express the area A of the rectangle as a function of s.
Answer: The area of the rectangle is A=
(1 pt) For the function f(x)=x2+5x, simplify each expression as much as possible.
(f(w)-f(x)) / w-x =