I need some help on my homework.

Question

You borrow $180 from a friend who doesn't charge you interest. You work out a payment schedule in which you will make weekly Payments to your friend. The balance B (in dollars) of the loan is given by the function B= 180-pn where p is the weekly payment and n is the number of weeks you make payements. A. Without finding the intercept, state what they represent. b. Graph the function if you make weekly payments of $20. C. Find the domain and range of the function in part (b) how long will it take to pay back your friend? D. Suppose you make payments of $20 for three weeks. Then you make payments of $15 until you have paid your friend back. How does this affect the graph? How many payments do you make?

Answer 1

See the video explanation.

The answer is that it takes 9 weeks under the first payment plan and 11 weeks under the alternate payment plan.