Now we'll combine the last 2 scenarios: Oxygen varies directly as temperature and inversely as pressure. The volume of a
certain amount of oxygen is 20 in when the temperature is 60° and pressure is 30 psi.
Find the volume when the temperature is 90° and the pressure is 40 psi.

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?