Darrell writes 15 text messages in 5 minutes. what is the minutely rate? texts per minute

The function show two sisters' savings account and the rate at which they plan to deposit money

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

7+(3n++8) what is the answer to this?