Help me quickk pleaseee

Alake near the arctic circle is covered by a sheet of ice during the cold winter months. when spring arrives, the ice starts to melt. s(t) models the ice sheet's thickness (in meters) as a function of time tt (in weeks). s(t)=-0.25t+4

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Alex's monthly take home pay is $2,500. what is the maximum bad debt payment he can maintain without being in credit overload?