Help please I don’t understand how to solve it

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.

Pls yall i really need the answer fr fr

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.