Answer:
The difference in per-mile costs for the two companies is $0.12
Step-by-step explanation:
Gabi sets up the equation
to find out after how many miles, m, the companies will charge the same amount.
The first company charges
for m miles driven.
The second company charges
for m miles driven.
In both these functions, numbers 7.20 and 8,40 represent the initial fee the companies charge.
Numbers 0.22 and 0.1 represent per-mile costs.
Thus, the difference in per-mile costs is 
Another way to solve this problem is to find the cost per mile driven for each company:
1. Cost per-mile 1st company

2. Cost per-mile 2nd company

3. Difference:

Move from left to right to find the domain.
Domain: -4 to 2 which is [-4,2]
*For domain and range, brackets are used to indicate that values like -4 and 2 are included in the solution set.
Move from bottom to top to find the range.
Range: -3 to 3 which is [-3,3]
Good luck to you! Ask any questions you may have!
The answer would be 0.3316
An integer is a whole number, or a number that is not a fraction. So, you should just take the dollar sign off the $460, and it will be an integer. In other words, it is already an integer.