7. You've been asked to build a machine for a TV commercial that launches shampoo bottles from ground level over the heads of models with their unruly hair stacked high. You estimate the shampoo needs to clear at least 9 feet in order to sail over their heads. The equation that represents the height of the bottle as a function of time (t) in seconds is: h=-16t + 35.2t How many times does the shampoo cross the 9 foot threshold? shampoo reaches 9 feet times