The swimming pool is open when the high temperature is higher than 2 0 ∘ C 20 ∘ C20, degrees, start text, C, end text. Lainey tried to swim on Monday and Thursday (which was 3 33 days later). The pool was open on Monday, but it was closed on Thursday. The high temperature was 3 0 ∘ C 30 ∘ C30, degrees, start text, C, end text on Monday, but decreased at a constant rate in the next 3 33 days. Write an inequality to determine the rate of temperature decrease in degrees Celsius per day, d dd, from Monday to Thursday.