Question

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Answer 1

#2 of the statements should say m<2 + m<3 = 180 degrees

Answer 2

#4 of the statements should say m<1 + m<2 - m<2 = m<3 + m<2 - m<2

Answer 3

and reason #5 seems like it should be simplify

Answer 4

#3 is substitution yes, you dont have to write property tho ;)

Answer 5

yes