Ahmad opened a savings account with $9000 and was paid simple interest at an annual rate of 8%. When Ahmad closed the account he was paid $1440 interest. How long was the account open for in years.

Me. i can't figure out this question. give an explanation too. .

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]