Can someone me solve this question for geometry? it has to do with in advance : ) i'll give 20 !

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

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

What sums are equal to 6/12? choose all answers that are correct a.6/12+6/12+6/12+6/12+6/12+6/12 b.2/12+1/12+1/12+2/12 c.5/12+1/12 d.1/12+1/12+1/12+3/12 plz : )