River dale school is holding a worldwide election to chose a school color, 5/8 of the votes were blue, 5/9 of the remaining color were green, and remaining 48 votes were red

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?