Please help me i am struggling to do this thanks.

b) A single stage continuous biological waste treatment system operates under isothermal and steady-state conditions. The substrate concentration in the inlet stream (Si) is 350 mg L-1. Cell growth follows Monod kinetics and the endogenous respiration coefficient ( ka ) for the microorganism is 0.0083 d-1. Field data obtained at different hydraulic retention times produced the graph given below. An equation representing a straight line fitted to the data is also shown in the figure. Using the information provided in the graph: i) The linear equation represented in the graph is related to the Monod equation. Explain the simplifying assumptions used to obtain this linear equation (100 words maximum), and calculate the maximum specific growth rate of the microorganism Umax, and the Monod constant Ks for the system; [6 marks] ii) Estimate the hydraulic retention time when the substrate concentration at the outlet of the treatment system is 7.5 mg L-?. [4 marks] 1 + Oka (days) = y = 10.1082x + 0.3571 R2 = 0.9914 = 1/S (L mg 1) PLEASE TURN OVER