A rectangle that is x feet wide is inscribed in a circle of radius 12 ft. a) Express the area of the rectangle as a function of x. b) Find the domain of the function. c) Graph the function with a graphing calculator. d) What dimensions maximize the area of the rectangle? a) Express the area of the rectangle as a function of x. A(x)=x576-x (Simplify your answer.) b) Find the domain of the function. Choose the correct answer below. OA. {x1-24 x24} OC. {x|x576} O E. {x|x576} OG. {x|x