Sophie has $4.20 worth of dimes and quarters. She has twice as many quarters as dimes, write a system of equations that could be used to determine the number of dimes and the number of quarters that Sophie has, define the variables that you use to write the system.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 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 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.