The number of hats Mrs. Espinoza can knit varies directly with the number of hours available. Mrs. Espinoza can knit 4 hats every 6 hours. she wants to knit enough hats so that all of the 18 people in her family can have 1 each. How many hours will it take to knit 18 hats?
A. 27
B. 12
C. 18
D. 20

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.