Suppose that the functions s and t are defined for all real numbers x as follows. s (x) =x+1 t (x) =2x+1 Write the expressions for (s + 1) (x) and (s . ) (x) and evaluate (s -t) (3). (s + + ) (x) = 1 (s' t) (x) = 0 X 5 (s - 1) (3) = 0