20 POINTS! Please help, best answer will recessive brainliest answer points as well as 5 stars and a thank you. :)

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

For how answer my question this will be the last question can you answer in math subject

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earned $75 in interest. how much interest will she earn during the following year?