This problem mentions 'CHOICE,' which means you need to share the several possible answers that came with this problem.
There is an upfront charge of $12 per car. Next, each person in the car is charged $1. Supposing that x people are in the car, then the total cost, C(x), is
C(x) = $12 + ($1)x. This is a linear function whose domain could be, for example, [0,6], assuming that 6 people could fit into the car.
SOLUTION
Given the question on the question tab;

The trace on the graph is given below;

Final answer:
The volume of the box when x=1 is 15 cubic inches.
Answer: x=5 y=6
Step-by-step explanation: 6y=3× +21
6y-6=2× +20
Opposite sides of the rectangle are equal
Substitute 3x +21 into 6y in the second equation.