### Functions : Parabolas and Difference Quotient

1. Given that f(x) = x^2 - x +4 and g(x) = (sqr root x) +2 find (f o g)(x) 2. Find the equation of the parabola with focus F(12,20) and directrix y = 10 3. For f(x) = 1/ (x -2) , find and simplify the difference quotient (f(3+h) -f(3)) / h