3.03 Key Features of Exponential Functions Question 1: The average price for a new car is $30,000. Each year, the value of that car decreases by 15%. The function to represent this situation looks like this: f(x) = 30,000(0.85)x a) What is the y-intercept? What does that represent? b) You decide to stop checking the value of the car after it hits $15,000. What is a reasonable domain to represent this decrease in value? c) Find the average rate of change of the function f(x) from x = 4 to x = 9.