If the expression -120 + 13m represents a submarine that began at a depth of 120 feet below the sea level an ascended at a rate of 13 feet per minute. What was the depth of the submarine after 6 minutes

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?