Melanie is taking flute lessons. her flute teacher charges $32.50 per hour. if melanie has 2.5 hours of lessons each week, what is the weekly charge for her lessons?

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?