A lake near the Arctic Circle is covered by a 2
22-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
33 weeks, the sheet is only
1.25
1.251, point, 25 meters thick.
Let
y
yy represent the ice sheet's thickness (in meters) after
x
xx weeks.