There isn't enough information for me to help you. Could you attach a picture so that I can see the triangle and where angles B and C are? Thank you.
Answer:
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Answer: 720 ways
Step-by-step explanation:
We know that the total number of ways to arrange n things in a row in order is given by Permutations.
i.e. The total number of ways to arrange n things in a row= n!
Therefore, the number of ways to arrange 6 unique CD's in order along a shelf will be :

Hence, there are 720 ways to arrange 6 unique CD's in order along a shelf.
Answer:
30
Step-by-step explanation:
2x + x =90
3x=90
x=90/3
x is 30
D is your answer.
Hope this helps & good luck. :)