Answer :

m//n if the external alternating angles are equal, that means:
(3x+12)°=48°

Solving for x:
3x+12=48
3x+12-12=48-12
3x=36
3x/3=36/3
x=12

Answer: Option B. 12
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Answer:

The answer is D. 52

Step-by-step explanation:

edg 2020

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