Tenho prova amanhã de Progressão Aritmética, mas não entendi essa questão! Determine o valor de x, de modo que os quadrados dos números (x+1), Vx+15 e (x+3) formem,
nessa ordem, uma PA.
(Vx+15, o V representa uma raiz)

​

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.