Math, Trig
posted by Hanny
A soccer player kicks a ball from the ground to a maximum height of 12 m. The high point in the trajectory of the ball occurs at a distance of 18 m from the kicker. On the downward path, another player heads the ball at a height of 2.2 m from the ground.
Write a quadratic function that models the situation.
my ans 
y = a (x+2.2)2 + 12
y = a (0 +2.2)2 + 12
12 = a(2.2)2
a = 12/(2.2)2
a= 2.47..
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