4. I get an MRI at UNC Hospitals. It costs $1500, but the hospi- tal gives me an option to pay this off in installments. (They do not charge interest). I have two options. (a) Pay off 10 % of the...

Extracted text: 4. I get an MRI at UNC Hospitals. It costs $1500, but the hospi- tal gives me an option to pay this off in installments. (They do not charge interest). I have two options. (a) Pay off 10 % of the remaining debt each month. Write a function f(x) which is my debt after x months. Hint: try it after 1 month, 2 months, 3 months. When does my debt reach $100 ? (b) Pay off $80 each month. Write a function g(x) which is my debt after x months. Hint: try it after 1 month, 2 months, 3 months. When does my debt reach $100 ? When do I pay it off completely?