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D, Each x value has one and only one y value.; This is because if an x-value repeats itself then it is not a function. You can test this on a graph by drawing a vertical line on it. If the vertical line intercepts the line more than once anywhere on the graph, then it is not a function.
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Answer:
$68 to hire and 28.25 per hour to hire both
Step-by-step explanation: