Answer:

Step-by-step explanation:
The instants when hovercraft lands on the ground are those when h(x) = 0. Given that height function is a second-order polynomial in its factorized form, such instants are related to the roots of the function.
Time is a positive real number and the only possible solution:

Subtract 7.33 from 12.
it gives you 4.67 which in this case can be 4.66 meaning she needs 4 and 2/3 more feet of ribbon, hope this helped