[Maximum mark: 6) Let /(x)= -3x + 8x 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 (a) Write down an integral which rep region R (b) Find the area of the region R