Question 43
Very simple. The problem says that y is height. So, put word height instead of y:

{{{height=55+33t-5t^2 }}}

Since the problem tells you that height is 80 feet, you have

{{{80=55+33t-5t^2 }}}

or

{{{-5t^2+33t+55-80=0}}}

that is your quadratic equation.