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