What phrases can be represented by the algebraic expression 12 over w

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?

How can (square root of 25) ^2 be rewritten?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2