Question 1201821
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To answer this question, simply substitute x= 0 into the height function,
because x= 0 seconds is the starting moment. You will get


    h(0) = -3*(0-3)^2 + 108 = -3*3^2 + 108 = -3*9 + 108 = -27 + 108 = 81 meters.


<U>ANSWER</U>.  The height of the hovercraft at the time of takeoff was 81 meters.
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Solved.