Answer:
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Step-by-step explanation:
Answer: D. 12h + 21h2
Step-by-step explanation: The answer is D,
because when you devide 12h/3h = 4
and for the other value 21h2/3h=7h
4 + 7h
if you perform the same operation with the rest of answers you will get a minor values if you compare with this results, because of that the answer with the greatest common factor is D.
To multiply whole numbers and fractions, multiply the numerator by the whole number. Example: 1/3×4= 4/3=1 1/3
Either use a graphing calculator or substitute the value of x for x