Sam ran several errands and used 7 gallons of gas. There were 5 gallons left in the tank. (Use g as a variable.)

Step-by-step explanation:

Given

Required

Determine the additional gallons used (g)

This is calculated as:

So, we have:

Make g the subject

step-by-step explanation:

b and c

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right