During a snowstorm, Ian tracked the amount of snow on the ground. When the storm began, there were 3 inches of snow on the ground. Snow fell at a constant rate of 2 inches per hour until another 10 inches had fallen. The storm then stopped for 6 hours and then started again at a constant rate of 3 inches per hour for the next 2 hours. Make a graph showing the inches of snow on the ground over time using the data that Ian collected.