Harris is building a deck around his pool. his contractor charges $525 for labor plus an additional $4.75 per square foot for materials. which equation can be used to determine the cost, in dollars, for a deck with an area of x square feet? a) f(x) = 529.75x b) f(x) = 4.75x + 525 c) f(x) = 525x + 4.75 d) f(x) = 4.75x + 525x