An algebraic relationship of that quantity is greater than or less then another quantity ?

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

Write the fraction or mixed number and the decimal shown by the model

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?