(a) Estimate the area under the graph of f(x) = 4vx from x = 0 to x = 4 using four approximationg rectangles and right endpoints. (Round your answers to four decimal places.) RA = Sketch the graph and the rectangles. 8 6 R(x) = 4Vx R(x) = 4Vx 4 O 1 2 3 00 6 A(x) = 4Vx 6/ R( x) = 4VX 2 3 2 3 Is your estimate an underestimate or an overestimate? overestimate underestimate (b) Repeat part (a) using left endpoints LA = Sketch the graph and the rectangles. 8 6 f(x) = 41x R(x) = 4Vx 2 O 1 2 3 2 00 RX) = 4Vx 6 ((x) = 4Vx