At a point 20m from the base of a water tank, the angle of elevation of the top of the tank is 45°. what is the height of the tank?

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.