35 is the correct answer choice
Answer:

Step-by-step explanation:
see the attached figure to better understand the problem
Applying the law of cosines

substitute the given values


Please refer to the attached file, wherein will be found all eight exercises, solved, sketched, and written.
In conclusion, I would be remiss if I failed to express my gratitude for the sumptuous bounty of five (5) Brainly points with which I have been showered in return for these labors. Moreover, the crunchy green bread and turbid grey water upon which I have snacked while completing this task were also fondly appreciated, and are gratefully acknowledged. The beatings have been most effective, and morale has improved immeasurably.
Answer:
Step-by-step explanation:
logx
<=> logx + 2logy = a (1)
log
y=b <=> 3logx + 6logy =b (2)
(1),(2)=> logx= 
logy= 3a-b
=> log
=logy-logx=3a-b -(
) = 
log
=
(logx+logy)=........ OK