Hey can you me posted picture of question

Can someone answer 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?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.