Use f(x) = 2x + 5 and g(x) = x^2 + x - 6 for following combinations.
A. (f + g)(x) = ___________________
B. (g – f)(x) = ___________________
C. (g + f)(3) = ___________________
D. (fg)(0) = ___________________
E. (fg)(-1) = ____________________
F. (g / f)(1) = _______________