The parent function f(x)=x^3 is represented by graph a. Graph a is transformed to get graph b and graph c. Write the functions represented by graph b and graph c

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?