A science class has a total of 47 students. The number of males is 13 more than the number of females. How many males and how many females are in the class?

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.

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