Find the sum, for alg 2 plato

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

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.

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