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Calculus1
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Use left endpoints and 6 rectangles to find the approximation of the area of the region between the graph of the function 5x^2-x-1 and the x-axis over the interval [5,12]. Round your answer to the nearest integer.
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This is a Reimann sums problm.
\[h = {b-a\over n}\\ A=h\sum\limits_{k=0}^{n-1}f(a+nh) \]
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