I think it's x^4.
(Honestly, I feel 90% positive of this answer, so maybe just get one more opinion!)
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Answer:
<em>It is D.4/9x=37/3</em>
Step-by-step explanation:
i took the test
when people say " in lowest terms" they usually mean like the simplified version of an answer
an example of this would be like
make
into lowest terms
the answer would be 
if you dont understand comment on this and ill try to break it down more