Answer:
C
Step-by-step explanation:
14 : 16
7 : 8
boys : girls
The law of cosines states that, if 
is the angle between sides b and c,
So, plugging our values, we have
This is equal to
All you have to do is combine like terms. 2c and (-c) are like terms (-5b) and (-b) are like terms and a is a term. So, 2c combined with (-c) is C. (-5b) and (-b) combined is (-6b). Since a doesnt need to be combined with anything, you leave it as it is so your answer will then be c - 6b + a (this is the answer assuming that there is a + in front of the a. If there is a - sign, then just change your +a to -a at the end
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