13. By what transformation are the graphs of f(x) = sec x and f(x) = cso x related? (a) Phase shift right ~ units (b) Reflection in the y-axis V It ) = [120 - t (c) Phase shift right " units (d) Reflection in the x-axis Mark Value: 2 14. The volume of water in a bathtub is modelled by V (t) = (120-t)" 9 , where V represents the volume of water in litres after t minutes. Approximate the instantaneous rate of change of water volume after 60 minutes. Remember to include units. Mark Value: 2