2 answers:
Answer:
Student B is incorrect
Step-by-step explanation:
They added terms with variables of different powers.
It is not our problem do it by your self
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I think the question 23 is e.
Your answer is 3/5, the picture below shows how sin cos tan work!
we have

we know that

therefore
<u>the answer is</u>
The expression equivalent is 
Answer:
-1.5 per month
Step-by-step explanation:
-3 sales/2 months