Please Help! Need this done soon!

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?

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1