How much should be deposited in an account paying 8.5% interest, compounded semiannually, in order to have a balance of $ 7,000 after 7 years and 6 months?

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

How do you write something in scientific notation?