Question: 1. Using n = 4 equal-width rectangles, approximate x2+8 dx . Use the left end-point of each sub-interval to determine the height of each rectangle.




1. Using n = 4 equal-width rectangles, approximate x2+8 dx . Use the left end-point of each sub-interval to determine the height of each rectangle. -23. Find the interval on which the curve of y= dt is concave up. 1+t+12
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