Question

An airport parking garage costs $20 per day for the first week. After that,
the cost decreases to $17 per day.
a. Write a piecewise function for the cost of
parking a car for x days.
f
x
 {
20x if x  7
17x  21 if x  7
b. What is the cost to park for 10 days? $191
c. Ms. Anderson went on two trips. On the first, she
parked at the garage for 5 days; on the second,
she parked at the garage for 8 days. What was
the difference in the cost of parking between the
two trips?