If the probability of an event is 22/73, what is the probability of event not happening?

1foot = 12 inches; 1 yard = 3 feet

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?

Could someone with number 1 and 2