I need help with this 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?

Which of the following circles have their centers in the third quadrant?

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?