*NO LINKS PLEASE* I need help with these, the answer options are as follows: always true, sometimes true, never true

Thank you!!

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 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Acircle has a circumference of 28.36 units what is the diameter of the circle

Which value of y will make the inequality y< -1 false?