2a^3+250b^3 could somebody factor this? : )

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =