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)=-x*2+11 from x=-2 to x=2 (a)Use left endpoints. ​(b) Use right endpoints.   ​(c) Average the answers in parts​ (a) and​ (b) ​(d) Use midpoints.

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