To use the Commutative Property to determine the missing step in the proof, we need to rearrange the terms in the expression \(12a + 10 + a\) so that it matches the format of \(10 + a + 12a\). The correct missing step should show the rearrangement of the terms.
The missing step is:
Step 1: \(10 + 12a + a = 10 + a + 12a\)
This step ensures that all the terms are rearranged to isolate the like terms consistently.
The full proof would look like this:
Step 1: \(10 + 12a + a = 10 + a + 12a\)
Step 2: \(10 + 13a = 10 + 13a\)
Step 3: The expressions are equivalent because they both equal the same value.
So, the response you should choose is:
10 + 12a + a = 10 + a + 12a.
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