At shayna’s printing company LLC there are two kinds of printing presses: Model A which can print 40 books per day and Model B which can print 70 books per day. The company owns 13 total printing presses and this allows them to print 820 books per day. How many of each type of press do they have?

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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mean, 40.6

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the first option is the answer.