11 minus a number “ is the same as

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?

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

Find two numbers if their sum is 91 and the ratio is 6: 7?