Which product is greater than 3/4?

Simplify the expression. enter the correct answer.

How to use order of operation in 20 divide by 4 multiply 5 = 1

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?