Find the mean, median, and inter quartile for the data set below 17,23,8,5,9,16,22,11,15,17,18

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 will form a composite function?

Need plz been trying to do it for a long time and still haven’t succeeded