If f:R → R is defined by f(x) = x² - 3x + 2 then f(f (x)) = _______.

Let f:{2, 3, 4, 5} → {3, 4, 5, 9} and g = {3, 4, 5, 9} → {7, 11, 15} be functions defined as f(2) = 3, f(3) = 4, f(4) = f(5) = 5 and g(3) = g(4) = 7 and g(5) = g(11) = 11
Find g o f(2)

Find fog if f(x) = |x| and g(x) = |5x - 2|

A relation R on a set A is called an equivalence relation iff

The function f; R → R defined by 
f(x) = [x] x ∈ R is

The function f:R → R given by f(x) = 2x is