Round to 2 decimal places

Approximate the area under the graph of 2 f(x) and above the x-axis with rectangles, f(x) = - +2, from x = 1 to x = 9 using the following methods with n = 4. X (a) Use left endpoints. (b) Use right endpoints. (c) Average the answers in parts (a) and (b) (d) Use midpoints