Given that lines a and b are parallel and that m∠4 = 128°, find m∠7.

Since lines a and b are parallel and that m∠4 = 128°, therefore:

m<7 would be:

m<7 = 180 - m<4 = 180 - 128 = 52 degrees

Therefore, the measure of angle 4 would be 52 degrees.

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