I need some help on this please Simplify 2c-5c+c

You have $600,000 saved for retirement. your account earns 5.5% interest. how much, to the nearest dollar, will you be able to pull out each month, if you want to be able to take withdrawals for 20 years?

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).