Apattern follows the rule "starting with one, every consecutive line has a number one more than twice the previous line".1. how many marbles must be in the fourth line?

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?