Question

f/g=? Given that f(x)=x^2-9 x and g(x)=x + 14

Answer 1

If you want the ratio of two functions, just write them that way,
[x^2 + 9)/(x + 14)

If you want f of g(x), sometimes written f[g(x)], then you should have said so. Plug in the (x+14) where there is an x in f(x), and compute the new function.