Marques has a rectangular backyard that measures 80 feet by 60 feet. He wants to make a garden, and he decides he will place brick pavers to form a uniform border around the sides of the garden so he may walk around without trampling any plants. He is considering several sizes of pavers, so he lets represents the width of the border, as shown below. Enter answers in the form: Ax^2+Bx+C,n,m without extra spaces. (a) Find a polynomial that represents the area of the garden in square feet. (b) Find the area of the garden if he uses pavers that are 5 feet in width. (c) If he wants his garden to be 3,744 square feet, what size pavers should he use