Math

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A stunt pilot is testing a new plane. The equation that models his height over time is f(x)=15x^2 -195x +950, where x is his the time in seconds and (fx) is his height in metres. Determine when the pilot is below 500 metres.

Do i sub in 500 metres for f(x)?

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    Why did you not follow Steve's suggestion when he answered you the last time you posted this question.
    He is right, do what he said.

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