If f(x) and g(x) are two functions defined by f(x) = √(x + 1) g(x) = | x - 1 |, then what is the value of f(g(9))?

Can someone help me find f(g(x)) and g(f(x)) for both of the functions

Find f-1(x) for the function f(x) =- In X-2 X+5 f1(x) = (Simplify your answer.)

How can I determine whether each of these functions is O(x2)?   (a) f(x) = 7x + 3 (b) f(x) = 5x2 + 8 (c) f(x) = 3 + 2x3