After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?
A46 gram sample of a substance that is used to sterilize surgical instruments has a k-value of 0.1374. find the substance's half-life in days, round to the nearest tenth.
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