1. The problem statement, all variables and given/known data Attached scanned image with all variables, given data, and relevant equations. 2. Relevant equations See 1. 3. The attempt at a solution I've also attached my working for the question. Normally these questions are extremely easy, so I feel a little silly for asking, however I've never done one of these where we're given pi as a limit on the x and y planes so I'm not sure I've done this correctly and may have oversimplified it.. I've literally placed an approximate sqrt(pi) marker on my x-axis and twice that on the y-axis for 2sqrt(pi). When I compute the integral the calculations are neat and simple which makes me think it's correct, but I'd appreciate some confirmation on that if possible, thanks :) *EDIT* My answer to question 1 should be 2, not -ve 2. Also, I'm not really sure what standard procedure is here, but I have a second question which again I think I may have correct but I'm not sure. Rather than hog the forum space with a second thread would I be able to add it to this one? Just in case that's acceptable, I've attached a second image with the question and my attempt at the solution, if not, please disregard the second image :). Regarding the second question, I'm mostly unsure about the limits I've selected. Images labeled "1" and "2" for questions 1 and 2 respectively.