3(x + 2) - 6 = 15 please heelp

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

In a column proof the right column states your reasons

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?