Estimate the area under the graph of from to using approximating rectangles and left endpoints
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Originally Posted by sss Estimate the area under the graph of from to using approximating rectangles and left endpoints $\displaystyle \Delta x =\frac{4-1}{3}=1$ so our sample points are 1,2,3 so the area is $\displaystyle \Delta x(f(1)+f(2)+f(3))=1(5+12+21)=38$
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