Over a period of five days, the average time of a commuter train trip from one town to the city was 77 minutes. one trip was 71 minutes, another was 74 minutes, and two were 78 minutes. how many minutes long was the fifth trip?

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

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