The swimming pool is open when the high temperature is higher than 20°C. Lainey tried to swim on
Monday and Thursday (which was 3 days later). The pool was open on Monday, but it was closed on
Thursday. The high temperature was 30°C on Monday, but decreased at a constant rate in the next 3 day
Write an inequality to determine the rate of temperature decrease in degrees Celsius per day, d, from
Monday to Thursday.
30 – 3d > 20
What is the solution set of the inequality?