I'm wondering if someone could check my work please?

Question

I have a table:

Distance driven in miles Total Cost
0

Answer 1

Sorry, my computer bleeped out for a second due to bad weather --

Ok, here is the table:

The table shows the cost of renting a full-size rental car, based on the number of miles driven.
Distance Driven in miles Total Cost
0 $68.97
50 $88.47
100 $107.97
150 $127.47
200 $146.97

1)Find the slope of the line and explain what it means.

I did 88.47 - 68.97/50-0 to get $.39 is the slope which means that the cost per mile of renting the car.

(although I'm slightly doubting that because the inital cost is $68.97 for just getting the car??)

Find the y-intercept and explain what it means.

This I am stuck on because I thought the left column in a table was the x axis and the right column was the y axis so I'm not sure how to get this????

Determine the equation of the line. If I use the slope determined above, assuming it is correct, I believe the equation would be 68.97 + .39x
That's an expression, not an equation, but I'm not sure what to make it equal to??

I am trying to decide whether I can afford to rent a full-size car to drive to St. Louis, which is about 180 miles away. How much would that cost for a one-way trip? How much would it cost for a round trip of 360 miles?
If I use the above and plug in 180 for x, I get $139.17 for the entire trip. Multiply that times 2 for the 360 miles and I get $278.34.

Am I anywhere close to getting these answers correct?

Thank you for your help.