0.05 into fraction and percentage

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

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

What are the domain and range of the function f(x)=2^x+1