Calculus Help? Need urgent!!

Posted on 2017-05-17 18:19:00 in Math by PALO

1. Use the Midpoint Rule with n = 5 to estimate the volume V obtained by rotating about the y-axis the region under the curve y = sqrt(2+7x^3) , 0 ≤ x ≤ 1. (Round your answer to two decimal places.) 

I got V=11.75 but its wrong. 

2. Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the y-axis. y = 7x^2, y = 0, x = 1 

I tried 49/5pi and 98/5pi and still wrong.

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