Cindy's backyard is shaped like a rectangle that measures 20 feet long and 25 feet wide. How many square feet of sod does Cindy need to cover her entire backyard?

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0