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) 2x +2a. Use left endpoints.b Use right endpoints.c Average the answers in parts a and b,d. Use midpoints.from x 5 to x=7a. The area, approximated using the left endpoints, is.b. The area, approximated using the right endpoints, isc. The average of the answers in parts a and b isd. The area, approximated using the midpoints, is

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oproximate the area under the graph of f(x) and above the x-axis with rectangles, using the following methods withn=4. f(x) = 2x +2 Use left endpoints. Use right endpoints. Average the answers in parts a and b. Use midpoints. from x 5 to x =7 .w... -The area, approximated using the left endpoints, is. o. The area, approximated using the right endpoints, is C. The average of the answers in parts a and b is