Ralph was on his way from home to work when he remembered that he left his briefcase at home. He drove home and then drove back to work. Which of the following graphs could represent his distance from home as a function of time?
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It is important to keep in mind that the -values of the graph are showing Ralph's distance from home. When Ralph starts out in the morning his distance from home is zero. This distance from home increases until he turns around to go back home for his briefcase. The distance decreases as he travels back home. When he gets back home, his distance from home is again zero for a short time while he gets the briefcase. The distance from home then increases again.