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 Dec 14 accepted How to find volume of solid using double integrals? Dec 14 revised How to find volume of solid using double integrals? added 10 characters in body Dec 14 comment How to find volume of solid using double integrals? @user160738 They are parabolic cylinders, I will edit to clarify. Also that is not the answer I'm looking for. Dec 14 comment How to find volume of solid using double integrals? @user160738 The solid is not a cylinder but it is bounded by two cylinders and two planes. Dec 14 asked How to find volume of solid using double integrals? Dec 14 comment How to evaluate this definite double integral? (+1) Thanks, this helped me see my mistake. I didn't properly distribute the negative sign when evaluating the inner integral. Dec 14 comment How to evaluate this definite double integral? Why does the range of the inner integral change to $y^2,0$ instead of $y^2,y^2-y$ - I thought you put the original range of integration into the u substitution equation? Dec 14 accepted How to evaluate this definite double integral? Dec 14 comment How to evaluate this definite double integral? I got -8, I must have made an arithmetic error or something! Dec 14 asked How to evaluate this definite double integral? Dec 11 accepted Simple directional derivative question Dec 8 comment Simple directional derivative question @charlestoncrabb Thanks, got it. Dec 8 awarded Teacher Dec 8 answered Simple directional derivative question Dec 8 revised Simple directional derivative question added 2 characters in body Dec 8 asked Simple directional derivative question Nov 8 accepted Questions about how to input both odds and payoff into expected value function Nov 6 asked Questions about how to input both odds and payoff into expected value function Oct 31 comment How many permutations of letters are in “MATHISFUN” without words MATH , IS , FUN @cr001 How are the intersects being calculated? Oct 25 accepted Transforming and identity for $n \choose k$ with the “committee and chair” trick