Which of the following are useful ways of finding the value of a variable? check all that apply

a. writing an equation
b. drawing a graph
c. reading a table
d. drawing a diagram

The anwser cause i do not understand just plez

Ithink i know it but i want to be sure so can you me out ?

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?