please do fast will rate!

a. Here shown below are Do measurements for a primary effluent sample. (1) Pick the best dilution and calculate the BOD. (2) Using your calculated BOD, calculate the BODu and then use that value to calculate the BODs. Assume k = 0.20/d. Vol sample (mL) 10 20 DO. (mg/L) 8.3 8.1 DO-(mg/L) 5.8 2.2 BOD= BOD. BODs = b. Sketch a graph below showing BOD, as a function of time (like the graph in Exercise 3) assuming the sample was incubated at 20 C. On the same plot, add a line showing the relationship for the same sample, but assuming the incubation temperature was 25 C. (Remember that k increases as T increases.)