Please answer these questions asap

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?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?