plz guys i put a picture of where i need help ok so ur supposed to put lke what is 4 equal to easy I I I I= 4 but when look in my study guide 6 = I I like i dont get itt. I am even using a study gide and its making me more confused

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?