To complete expression II so that it is equivalent to expression I, we first need to expand expression I:
Expression I: \[ 9(12 + y) \]
When we apply the distributive property, we get: \[ 9 \cdot 12 + 9 \cdot y = 108 + 9y \]
Therefore, to make expression II equivalent to expression I, we can write: Expression II: \[ 108 + 9y \]
So, the completed expression II is: \[ 108 + 9y \]