Answer:
Answer Choice 'A' would be correct.
Answer: n = 4
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Answer: width is 12, length is 16
Step-by-step explanation:
A= l*w
l=w+4
A=w(w+4)

factor
(w+16)(w-12)
w= -16 or w=12
width is 12, length is 16
X° + 123° + 90° = 360° (angles at a point)
x° = 360° - 90° -123°
x° = 147°
The answer of x is 147°
Hope I can help you :)