Jasmine earns $11 per hour. She worked 6 hours on Friday, 4 hours on Saturday, and 7 hours on Sunday. How much money did Jasmine earn in all on Friday, Saturday, and Sunday

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?