To clean windows of skyscrapers, some companies use a carriage. A carriage is mounted on a railing on the rook of a skyscraper a
nd moves up and down using cables. A crew plans to start at the 12th floor and move the carriage down as they clean the windows on the west side of a building. If the crew members clean windows at a constant rate of 0.75 floor per hour, the absolute value function f(t) = 0.75t-12 represents the number of floors above ground level that the carriage is after t hours. Graph the function. How far above ground level is the carriage after 4 hours?
