Answer:
I don't know the answer, sorry! But I'm stuck on this question too and I was wondering if you figured out the answer?
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Answer:
C
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Answer:
im sorry
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i need points or else ill fail
Answer:
No, he is not correct because the constant in his answer should have been 21 not 7.
Step-by-step explanation:

Therefore, the correct answer is the fourth; he should have put 21.