1. C = 3.50x where C is the cost and x is the number of tickests purchased
2. D = 55h where D is the distance traveled in h hours
3. P = 5h where P is the total pay for h hours worked
4. C = 10 - T where C is the change received and T is the total cost (0 < T ≤ 10)
5. L = .45N where N is the number of days and L is the length
6. R = 500 - T where R is the remaining miles and T is the miles alredy traveled (0 ≤ T ≤ 500)
