Which expression is a factor of 2x2 + 73 – 15?

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

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Find the ratios of the corresponding sides