Answer:
We need dimensions to answer this.
Tony has 24 books in total because if 1/8 of the books are mystery and there are 8 mystery books you have to multiple the denominator by the amount of mystery books (8*3=24).
It's C the missing side is 9 units long so since cosine is adjacent divided by hypotenuse it would be 9/41
-180 is the answer
explanation: order of operations
A. ASA similarity theorem
B. SSS similarity theorem