A Mercedes can go 78 miles on 3 gallons of gas. How far can it go with a full tank of 16 gallons?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Find the distance between (7,-6) and (-3,-9)

Cal's go cart has a gas tank with the dimensions shown below. he uses a gas can that holds 11 gallon of gas, to fill the go cart tank. 11 gallon = 231 inches^3 how many full gas cans will it take to fill the go cart's gas tank?