Answer:
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Step-by-step explanation:


This is the number of combinations of 2 from 23
23C2 = 23! / 2! 21!
A quick way to do this is 23*22 / 2 = 253
6 x 8 = 48, the answer is 8, just divide 48 by 6.
Answer:

Step-by-step explanation:
To calculate the angles of the given triangle, we can use the law of cosines:

Then, given the sides a=2, b=9, and c=8.

For B:

Answer:
...Okay thank you!
Step-by-step explanation:
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