Question

Amanda left the theatre, drove toward the shop, got gas, and then continued driving to the shop. Let g be the amount of gas (in gallons) in the gas tank at t minutes after she left the theatre. Sketch a graph that shows the relationship between g and t.
Choose the correct graph below.

Answer 1

Any time the car is driving, the amount of gas is decreasing.
The only time the amount of gas can increase is the short time when
the car is parked at the gas station and gas is being poured into it.

Amanda drover towards the shop, stopped and got gas, then
drove some more.  So the amount of gas decreases for a while,
then increases for a short time, then decreases again.

The middle graph is the one doing that.