Need help with this question. Sketch out the graphs that go with each part. So I can understand it better

Consider isentropic flow through a converging nozzle. The total (reservoir) pressure and temperature are py and Tj, respectively, and the ambient pressure is p,. A static pressure gauge at the nozzle exit measures the exit static pressure pe. (a) Nozzle choking is a compressible flow effect that obstructs the flow, setting a limit to fluid velocity because the flow becomes supersonic and perturbations cannot move upstream; in a subsonic flow, choking takes place when the exit Mach number reaches 1. Derive and calculate the critical pressure ratio 3 = p,/py at which the nozzle is choked. (b) Find an expression or expressions for p./po in terms of p,/po and sketch (in a plot) Pe/Po versus p,/po. (c) Find an expression or expressions for the exit Mach number M, in terms of p,/p, and sketch M, versus p, /po. (d) Find an expression for the dimensionless exit velocity wu,/ VRT, in terms of M, and sketch . versus pa/po. In all the above relations and plots, p,/po will range from 0 to 1. Mark clearly any critical values /points, including the starting and ending values on both the abscissa and ordinate in your plots