Sarah wants to join a gym. fitness gym charges a $120 enrollment fee and $25 a month. sports gym charges no enrollment fee and $45 a month. she writes the two equations c = 120 + 25x and c = 45x and graphs the solution. the graph shows in 6 months the gyms will cost the same amount. how much will the gym cost at 6 months

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?