Respuesta :

1.) 3 (3t + s)

distribute

9t + 3s

plug in the variables

9 ( 12 ) + 3 ( 9 )

108 + 27

135

2.) 2s - t

plug in the variables

2 ( 9 ) - 12

18 - 12

6

I hope this helped and i sincerely hope that this was the brainliest answer!

have a nice day