Twin more than 4 times a number is -18

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.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Measure of angles 31 (x+4) (3x+9) me