This is an example of the commutative property of multiplication.
That property states:

So using that property, we can figure out that
3 should be in the blank.
Answer:
8x+8y
Step-by-step explanation:
Thank you for posting your question here at brainly. Feel free to ask more questions.
The best and most correct answer among the choices provided by the question is <span>C. 1/20 </span>.<span>
</span><span>
Hope my answer would be a great help for you.</span>