Marcus estimates that 230 people will show up to the band concert at his middle school. The actual total attended was 300. Find the percent error.

30.43% error

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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.