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Let f(x) endpoints of the subintervals. (Round your answers to two decimal places.) (a) Use two subintervals of equal length (n = 2). (b) Use five subintervals of equal length (n = 5). (c) Use ten subintervals of equal length (n = 10). (d) Can you guess at the area of the region under the graph of f on the interval [8, 9]? square units Find an approximation of the area of the region R under the graph of the function fon the interval [0, 2]. Use n = 5 points to be the midpoints of f( x ) = x2 + 8 square units Find an approximation of the area of the region R under the graph of the function for the interval [0, 3]. Use n = 5 subintervals. Choose the representative points to be the midpoints of the subintervals. (Round your answer to one decimal place.) A( x ) = ge* square units