Heidi bought a machine that throws tennis balls for her dog to fetch. The height...

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Heidi bought a machine that throws tennis balls for her dog to fetch. The height of each ball thrown by the machine, in feet, is modeled by the function f(x) = - x + x + 2, where x represents time in seconds. How many seconds after the machine throws the ball does it hit the ground? 1 second3 seconds4 seconds2 seconds

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