In the diagram of circle a, what is m?
75°
90°
120°
135°

What does x = in this equation x+3+2x=x+5

Ineed to know the answer to this algebra question.

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?