Suppose that the functions r and s are defined for all real numbers x as follows. r(x) =x+6 s (x) =3x-4 Write the expressions for (r's) (x) and (r-s) (x) and evaluate (rts)(-2). (r.s) (x) = 0 (r - s) (xx ) = 1 X ? ( r+ s ) (- 2 ) = 0