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 - t ) (x ) = 1 ( s.t ) ( x) = 1 X ? ( s + 1 ) ( - 2 ) = 1