I think the answer is 2/3
11-2m-(n+5+(-m)-3n+8)
11-2m-n-5-m+3n-8
Answer: -2-3m+2n
A. 34 times 21 divided by 2 is 357. area of a triangle is base times height divided by 2.
Answer:

Step-by-step explanation:
cos O = adjacent / hypotenuse
cos O = 12/13
I hope I helped you^_^
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