Its in the tens place so the unit value is 30

<h2>
Explanation:</h2>
The commutative property of addition states that:

So applying this property to our expression we have:

<h2>Learn more:</h2>
Evaluating expression: brainly.com/question/14423698#
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Answer:
(D) he should have found that there are no solutions because the statement is false
Composite numbers are numbers that are not prime.