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Answer 1

I gotcha bud, the answer is 4. the identity property of multiplication

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Answer 2

Answer:

The identity property of multiplication

Step-by-step explanation:

If a, b and c are any real numbers,

By addition property of equality,

a = b ⇒ a + c = b + c,

By identity property of addition,

a + 0 = a,

By multiplication property of equality,

a = b ⇒ a × c = b × c,

By identity property of multiplication,

a × 1 = a

Thus, it is clear that,

'The identity property of multiplication' justifies Step 6 .