Answer:
The amount driven would be 275, and the cost for both plans will be 77.75$
Step-by-step explanation:
make both equations
y=0.09x+53
y=0.13x+42
set them equal to each other and solve for x to get the distance
take that number and put it in one equation and solve for y to get the price of the plan for that value
Just use the formula:

Then, plug in numbers:

And that would be your answer: 3/5 is the slope.
A) Increase. This is because the mean of the first two cars is smaller than the mean of all three cars.
b) Cannot be determined. Need more values.
c) Cannot be determined. Need more values.