18. The table shows the total distance a new car travels each month after it is purchased. What type of function can you use to model the data? Estimate the mileage after 1 year.

The model is in the picture below.


19. The total cost of an annual pass plus camping for x days in a National Park can be modeled by the function
f(x) = 20x + 80. Senior citizens pay half of this price and receive an additional $30 discount. Describe how to transform the graph of f to model the total cost for a senior citizen. What is the total cost for a senior citizen to go camping for three days?