[Maximum mark: 6] Let f(x) = -3x +8.x and g(x) = 2x. Let S be the region enclosed by the two curves and x . axis (a) Write down an expression which represents the area of the region S (b) Find the area of the region S [Maximum mark: 5] Let R be the region between the curve ya -3x* + 6x and x - axis (a) Write down an integral which represents the area of the region R (b) Find the area of the region R