What is the area of a circle with a radius of 10 yards

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

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Find the balance at the end of 4 years if 1000 is deposited at the rate of