The cross-sectional shape of the archway of a bridge (measured in feet) is modeled by the

function ƒ(x) = -0. 5x2 + 6x where ƒ(x) is the height of the arch and x is the horizontal

distance from one side of the base of the arch. How wide is the arch at its base? Will a box truck

that is 8 feet wide and 13. 5 feet tall fit under the arch? If not, what is the maximum height a

truck that is 8 feet wide and is passing under the bridge can be