During the cold winter months, a sheet of ice covers a lake near the Arctic Circle. At the beginning of spring, the ice starts to melt.
The variable sss models the ice sheet's thickness (in meters) ttt weeks after the beginning of spring.
s=-0.25t+4s=−0.25t+4s, equals, minus, 0, point, 25, t, plus, 4
By how much does the ice sheet's thickness decrease every 666 weeks?

3.5m

Explanation:

The equation that modeled the ice sheet thickness is given by

S = -0.25t+4

If the ice starts to melt at the beginning, the decrease rate of ice after 6weeks is gotten by simply substituting t = 6 into the given equation.

S = -0.25(6)+4

S = -1.5+4

S = 3.5m

The ice would have melts by 3.5m after 6weeks

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1