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Explanation & Answer
12
8x+3+10x-5 = 124 (exterior angle =sum of interior opposite angles
18x-2 =124
18x =126
x =126/18 =7
Angle A = 10x-5 =65 degrees
Angle B = 8x+3 = 59 degrees
13
2x^2-25= x^2
2x^2-x^2=25
x^2=25
x=5
Angle = 25 degrees
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