Plz answer quick hurry plz

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

Which of the following describes the graph of y--4x-36 compared to the parent square root function? stretched by a factor of 2, reflected over the x-axis, and translated 9 units right stretched by a factor of 2, reflected over the x-axis, and translated 9 units left stretched by a factor of 2, reflected over the y-axis, and translated 9 units right stretched by a factor of 2, reflected over the y-axis, and translated 9 units left save and exit next submit

If the value of cos330°is√3/2 then find cos 165°.