using matlab solve the problem

Problem Two: The discharge factor for the flow through an open channel of parabolic crossection is given by -2/3 4x Where x is the ratio of the maximum water depth to the breadth of the channel at the top of the water a) b) Determine the discharge factor, k, if the ratio, x, is 0.45 Plot the discharge factor, k, for 0.15 r0.65