# Lesson 18

Modeling Price Information

• Let’s predict some information.

### 18.1: What’ll It Be?

The points on the graph represent the average resale price of a toy in dollars as a function of time.

1. Use the information to predict the average resale price of the toy on day 12. Explain your reasoning.

### 18.2: Collectable Toy Price

The graph shows the average resale price for a toy in dollars as a function of time in days.

1. Estimate the average rate of change for the first 10 days.
2. Estimate the rate of change for the last 2 days shown.
3. Write a linear function, $$f$$, that models the data.
4. Predict the price of the toy after 12 days.