40 people adopted and 30 more people adopted

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

Find an equation for the linear function which has slope -10 and x-intercept -7

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)