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F(x)=2x
G(x)=x+5
Now
F(g(x))=2(x+5)
=2x+10
G(f(x))=2x+5
vertical angles are equal
so
2x + 24 = 146
2x = 122
x = 61
Answer
A. 61
Their corresponding sides are proportional and their corresponding angles are equal.
