Helppppppppppp plzzzz!

Answer:
0
Step-by-step explanation:
1/3 m -1 -1/2 n
Let m =21 and n =12
1/3 (21) - 1 - 1/2 (12)
Multiply
7 - 1 - 6
Subtract
6-6
0
Answer:
0
Step-by-step explanation:
Plug in the given values for m and n.
So, 1/3(21) - 1 - 1/2(12) =
7-1-6 =
6-6 = 0