Approximate the area under the graph of f(x) and above the x-axis with rectangles, using the following methods with n=4 f(x)=2/x+3 from x=1 to x=9 (a) Use left endpoints. (Round to two decimal places as needed.) (b) Use right endpoints. (Round to two decimal places as needed.) (c) Average the answers in parts (a) and (b) (Round to two decimal places as needed.) (d) Use midpoints. (Round to two decimal places as needed.)

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