1.A case is packed with 12 cylindrical cans, each having a diameter of 15 cm and height of 24cm. Calculate the volume of the empty space in the case to the nearest whole number.

2. Sketch the graphs of f(x)= -(x-1)(x+2)(x-4) and g(x)= -(x-1)(x+2)(x+2) and compare their shapes and the number of x-intercepts.