Suppose that the functions s and f are defined for all real numbers x as follows. s (x) = 2x 1 ( x) =x Write the expressions for (s . () (x) and (s +() (x) and evaluate (s -t) (2). (s .4) (3) = (s + 1 ) (x ) = 1 X 5 (s - 1) (2) = 0