College tuition is $12,000 per year for 4 years. Your parents will pay 20% of the total. You have Saved: $8,000. You have 4 years to save up the remaining amount for the entire 4 years tuition, how much do you need to save per month?

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?