The area of a rectangle is 90 sq. inches. it’s length is 9 inches longer than its width. find it’s length

Me because some of question i don’t understand

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?