Daisy taped two pieces of cardboard together to make a longer piece. the length of the first piece of cardboard was 1 2/5 meters. the length of the second piece of cardboard was 4 1/5 meters. what is the total length of the two pieces of cardboard daisy put together

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?