Posted by Jennifer on .
why is this a poor model for hitting a baseball?
y = 0.002x^2 + 0.879x + 3.981
I know it gets hit at approx. 4 feet high. The a gives the right shape like a hill. There's a 4.48 and 443.95 zero, which can be hit for distance. The max is (219.75, 100) so that seems doable. What am i missing?

algebra 
drwls,
Your wequation can be rewritten
y = 0.002(x^2 439.5x +48290) +95.58 +3.981
= 0.002*(x219.75)^2 + 99.56
It looks OK to me .