Plz! explain how u solved it i need as much as possible

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

The table above shows approximate conversions from gallons to liters. what is the value of x?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.