Below is a two-column proof incorrectly proving that the three angles of ΔPQR add up to 180°: Can someone please help me

Can somebody me out with this question

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?