The sorting as been done below:
<h3>What is Unit?</h3>
A unit of measurement is a quantity used as a standard to expressed a physical quantity.
Volume: Millimeter , Kiloliter
Length: Yard, Quart
Weight/Mass: Centigram, Ounce.
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For this case we have that by definition, the GCF (Greatest Common Factor) is the largest integer that divides the numbers.
We have the following expressions:

We find the factors of 9 and 6:

Thus, the largest number that divides 9 and 6 is 3
It is also observed that "b" is the common variable of both expressions
Therefore, the GCF of the expressions is:

Answer:

This is even because they all can be divided if it was odd you would not be able to decide them