Hello, could u help, please?

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

Identify the number as a rational or irrational. explain. 127

Determine the domain and range of the given function. the domain is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}. the range is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}.