A2.5 - 2.6: More on Linear Equations

A lake near the Arctic Circle is covered by a 2-meter-thick sheet of ice during the cold winter months. When spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. After 3 weeks, the sheet is only 1.25 meters thick. Write an equation for this situation.

Andrei wants to fill a glass tank with marbles, and then fill the remaining space with water.

W represents the volume of water Andrei uses (in liters) if he uses n marbles.

W=32-0.05n

What is the glass tank's volume in liters (do not include units in your answer)?