Ineed with this math question 3f+9< 21

Find the missing factor in exponential form 48^2=3^2 • ?

The circumference of a circle is 5 pi cm. what is the area of the circle?

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.