Find the product and simplify answer -3a^3(7a^4 - 5a + 5)

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

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?