Problem

When money is borrowed to purchase an automobile, the amount borrowed A determines the mon...

When money is borrowed to purchase an automobile, the amount borrowed A determines the monthly payment P. In particular, if a dealership offers a 5-year loan at 2.9% interest, then the amount borrowed for the car determines the payment according to the following table. Use the table to define the function P = f (A) in Exercises.

Amount Borrowed ($)

Monthly Payment ($)

10,000

179.25

15,000

268.87

20,000

358.49

25,000

448.11

30,000

537.73

Car Loans

a. Use the rounded linear model found in part (c) of Exercise 1 to find P = f(28,000) and explain what it means.


b. Can the function f be used to find the monthly payment for any dollar amount A of a loan if the interest rate and length of loan are unchanged?


c. Determine the amount of a loan that will keep the payment less than or equal to $500, using the unrounded model.

Exercise 1

When money is borrowed to purchase an automobile, the amount borrowed A determines the monthly payment P. In particular, if a dealership offers a 5-year loan at 2.9% interest, then the amount borrowed for the car determines the payment according to the following table. Use the table to define the function P = f (A) in Exercises.

Amount Borrowed ($)

Monthly Payment ($)

10,000

179.25

15,000

268.87

20,000

358.49

25,000

448.11

30,000

537.73

Car Loans

a. Are the first differences of the outputs in the table constant?


b. Is there a line on which these data points fit exactly?


c. Write the equation P = f (A) of the line that fits the data points in the table, with coefficients rounded to three decimal places.

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