algebra problem help?

mnr

r(x) = 3x - 1

s(x) = -x -1

find (r o s)(-3) and (s o r)(-3)

imogen-robertson_60b68e744ef23

I don't know if "Brenda" missed the sequence or not...

(r o s)(-3) =>

s(-3) = -(-3) - 1 = 3 -1 = 2

r(2) = 3 * 2 - 1 = 5

(s o r)(-3) =>

r(-3) = 3 (-3) - 1 = -10

s(-10) = -(-10) - 1 = 9

brenda

r(s(-3)) = -(-10) - 1

r(s(-3)) = 10 - 1

r(s(-3)) = 9

s(r(-3)) = -(-10) - 1

s(r(-3)) = 10 - 1

s(r(-3)) = 9