A parking garage charges $6 for the 1st 4 hours that a car is parked in the lot. So when we look at this problem, we want to know that for the 1st four hours we're going to get charged $6. So if we have 0 less than X less than or equal to four for the 1st 4 hours at $6, after that the garage charges an additional $3.00 an hour. So if we're charged $6 originally and then $3 for every hour after that. So we'd have X -, 4 because we don't get charged until we're past four hours. So if X was five 5 - 4, we'd be charged one $3. If X was six 6 - 4, we'd get charged two extra $3. So we have 6 + 3 times the quantity X - 4. If we simplify this out, we'd get three X -, 6, so three X -, 6 for X greater than 4. Now we're making some assumptions that we're going to just look at integers here when we're referring to an hours, because it doesn't talk anything about partial quantity of hours. There is a math function called the greatest integer function that if you're talking about partial hours, that maybe we should be introducing in this. I'm just not certain. So this would be a pretty typical generic algebra kind of setup. It could get more complex depending on what the expectation is.