At the end of a snow storm, Ella saw there was a lot of snow on her front lawn. The temperature increased and the snow began to melt at a steady rate. After the storm, the snow started melting at a rate of 1.25 inches per hour and it is known that 4 hours after the storm ended, the depth of snow was down to 10 inches. Write an equation for the function S(t),S(t), representing the depth of snow on Ella's lawn, in inches, tt hours after the snow stopped falling.