Workers at a quarry are removing rock at a daily rate of 0.1%. There are 3.2 tons of rock when the work begins. Which function can be used to find the number of tons of rock left at the end of d days?

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?