2pi*integral from 0 to 9.74679 of sqrt(144-x^2)-7 dx
no
first of all, it seems to me like you are using the disk (washer) method with the first suggestion i gave you. if so, please say that and don't leave us guessing.
secondly, if that is what you are doing, are you following the formula?
ya i thought i did that
i just times it by 2 to get rid of the bottom half fo the integral
so it was
2pi*integral from 0 to 9.74679 of sqrt(144-x^2)^2-7^2 dx
yes, but you didn't have the squares before, and keep parentheses around everything after the integral sign. note that squaring just gets rid of the square root in the first term. and let the upper limit be , just to be exact