Its height (in meters), x seconds after takeoff, is modeled by:
h(x)=-3(x-3)^2+108h(x)=−3(x−3)
2 +108h, left parenthesis, x, right parenthesis, equals, minus, 3, left parenthesis, x, minus, 3, right parenthesis, squared, plus, 108
What is the height of the hovercraft at the time of takeoff?