Suppose that the functions s and t are defined for all real numbers x as follows. s (x) =x-1 t (x) = 3x+5 Write the expressions for (s - t) (x) and (s.t) (x) and evaluate (s + t) (-2). (s - 1) (x) = 11 (s.t) (x) = 1 X 5 ? ( s + 1 ) ( - 2 ) = 1