The El Toro wooden roller coaster at Six Flags Great Adventure in New Jersey, has a maximum vertical drop of 176 feet above the ground. Xavier was standing 309 feet from the base of El Toro's maximum drop, where his line of sight is
4.5 feet above the ground. To the nearest tenth of a degree, what is the angle of elevation from Xavier to the top of the roller
coaster?

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

good luck on ur quiz test or homework. have a good day : )