Can someone help me with the questions in the picture?

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.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The distributive property allows you to say that 3(x − 1) = 3x −