What is the 9th term of 150, 60, 24...

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.

Solve the triangle. a = 21°, c = 105°, c = 5

If the value of cos330°is√3/2 then find cos 165°.