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A sprinkler head malfunctions at midfield in an NFL football field. The puddle of water forms a circular pattern around the sprinkler head with a

A sprinkler head malfunctions at midfield in an NFL football field. The puddle of water forms a circular pattern around the sprinkler head with a radius in yards that grows as a function of time, in hours: r(t) = 10?t. When will the puddle reach the sidelines? (A football field is 30 yards from sideline to sideline.)

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