I know how to calculate Riemann sums however whenever there is a square root involved with the sigma notation, I am completely stuck (with any problem that has a square root).

What I did get, however, is that b = 5 and that the function f(x) is f(x) = sqrt(25 - x^2). The question is #2 on the "temp.pdf" file. My (limited) work is attached on the "mywork.pdf" file.

Any help would be GREATLY appreciated!

Thanks in advance!