Which expression is equivalent to 9x – (x – 8)(x + 1) + 10x?

I'll give brainliest if you answer right : )

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 for x where 0 equation: cot^2x+2cotx+1=0