Could someone me? ? i am really stuck! i appreciate it! you so much! god bless!

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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?

Select the number of ways in which a line and a circle can intersect