Rosa earns 12 dollars per hour. In 7 point 5 hours, she will earn x dollars. Which is a valid proportion that can be used to solve the problem?

Rosa earns 12 dollars for every 1 hour, so the rate is 12/1 dollars per hour. For 7.5 hours, the rate is x/7.5; setting these equal gives 12/1 = x/7.5, which is choice C.

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