He swimming pool is open when the high temperature is higher than
20∘c20^\circ\text{c}
20
∘
c
20, degrees, start text, c, end text
. lainey tried to swim on monday and thursday (which was
33
3
3
days later). the pool was open on monday, but it was closed on thursday. the high temperature was
30∘c30^\circ\text{c}
30
∘
c
30, degrees, start text, c, end text
on monday, but decreased at a constant rate in the next
33
3
3
days.