[ Answer ]

[ Explanation ]
- Factor:
(a - 3) + q(a - 3)
-------------------------------------
- Expand
: 

: 

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Step-by-step explanation:
THE ANSWER IS C. 31 INCHES
Answer:
Angles in ascending order:
Q, R, S
Step-by-step explanation:
The side with the biggest number also has the biggest angle degree. The side with the smallest number also has the smallest angle degree.