Use the Midpoint Rule with n = 4 to approximate the area of the region bounded by the graph of f and the x-axis over the interval. Function Interval f ( x ) = 3x2+ 8 [-1, 3] Find the exact area. Sketch the region. O O -4 X -2 2 4 -4 -2 X 2 -10 -10/ -20 -20 -30 -30 i O