Isaac lives 3 miles away from his school. School ended at 3 p.m. and Isaac
began his walk home with his friend Tate, who lives 1 mile away from the school,
in the direction of Isaac's house. Isaac stayed at Tate's house for a while and
then started home. On the way, he stopped at the library. Then he hurried home.
The graph is a piecewise-defined function that shows Isaac's distance from
home during the time it took him to arrive home.