A marine biologist is testing a new under water probe. The probe is catapulted from the ship into the air, descends under water to a predetermined depth, and then returns to the surface where it can be collected. The function that models the probe's path is f(x) = 15x - 195x + 450, where x is time measured in seconds. The probe enters the water at 3 seconds. How long is the probe under water? %3D

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