Here is the answer to the equation. The photo below is the work shown.
x^2-3x-18
If she can drive 4180 miles in <em>two </em>weeks, it would make sense that she would drive an average of <em>half </em>that distance in <em>one </em>week. Half of 4180 is 2090, so she averaged 2090 miles each week.
8*4
I hope that helps !
So, 4*4*4*4 = 16+16 which is 32
You just multiple how many types of vehicles and the property of the vehicle (standard, custom etc.) to get 12 ways