Question

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Answer 1

I don't see that it is given that lines a and b are parallel. Without that, what I am about to write is not true.

Assuming that lines a and b are parallel,

<4 and <8 are congruent because if two parallel lines are cut by a transversal, corresponding angles are congruent.

5x + 2 = x + 50
4x = 48
x = 12

M<4 = 5(12) + 2 = 62.