So if the main question is 9q x 3 it would equal 27q
If you were to have (3,2) and find the reflection of the y axis, it would turn y into a negative, making it (3,-2).
This is a linear equation with y-intercept $50 and slope $0.25/mile:
TC = $50 + ($0.25)x, where x is the number of miles driven.