Solve the eqaution x=(4)/(3)\pi r^(3) for r

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0