Ruby and her friends are going into a restaurant. How much would it cost to buy 3 drinks and 4 tacos if each drink costs $2.25 and each taco costs $4.00? How much would it cost to buy 33 drinks and 44 tacos if each drink cost \$d$d and each taco cost \$t?$t?

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?