At the end of a snow storm, Allison 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 to melt at a rate of 0.75 inches per hour and is known that 4 hours after the storm ended, the depth of snow was down to 9inches. Write an equation for the function S(t),representing the depth of snow on Allison lawn, in inches, t hours after the snow stopped falling