Final answer:
22 is NOT a common factor of 16a and 20ab.
Therefore, the correct answer is: option A) 22
Step-by-step explanation:
The common factors of 16a and 20ab are factors that divide both of these terms evenly.
To determine which of the options is NOT a common factor, we need to find the factors of each option and see if they divide both 16a and 20ab.
A). 22: The factors of 22 are 1 and 22. Since neither 16a nor 20ab is divisible by 22, this is NOT a common factor.
B). 2a²: This is a common factor because it divides both 16a and 20ab evenly.
C). 4a²: This is a common factor because it divides both 16a and 20ab evenly.
D). 8a²: This is a common factor because it divides both 16a and 20ab evenly.
Therefore, the answer is A). 22 is NOT a common factor of 16a and 20ab.