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approximate the area under the graph of f(x) and above the x-axis with rectangles, using the...

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)=4x+5 from x=4 to x=6

A) use left endpoints

B) use right endpoints

C) average the answers in parts a and b

D) use midpoints

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