30 should be the correct answer
Answer:
(3b + 4) is the greatest common factor
Step-by-step explanation:

I have absolutely no idea i hate math so much
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It makes more sense if you think about it in numerical terms.
Say if there were 10 eggs per carton and there were 5 cartons, what would you do to find the total?
You would multiply them
It is the same in this case
The expression would be n x k
It can be written as just nk though
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The smallest exponents of the x and y term are 2. The Greatest Common Factor ( G C F ) for 9 x² y² and 5 x² y³ is: x² y².