Help me this is so hard

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?

What is 140 squared pleas me i am dumb

For her new mp3 player, alicia wants a case that is in. long. the online store shows case sizes in decimal measurements. what length case should she order?