33 1/2 of 1 day (in hours)

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?

Yvaries directly as x. y =90 when x=6. find y when x=13

Solve the equation for b: a= (1/2)(b)(h)