HELP WITH PRACTICE ACT MATH QUESTION:
the braking distance, y feet, for Damon's car to come to a complete stop is modeled by y=3(x^2+10x)/40, where x is the speed of the car in miles per hour. According to this model, which of the following is the maximum speed, in miles per hour, Damon can be driving so that the braking distance is less than or equal to 150 feet?

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@Vocaloid

Have you considered solving: 150=3(x^2+10x)/40

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