Witch one is better please help its for art class...

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

Two parallel lines are crossed by a transversal.what is value of x

What is the vertex form of f(x) = x2 + 6x + 3