4. We have introduced the process dynamics modeling and Simulink simulation of one simple tank (first-order) as well as two non-interactive simple tanks in series (second-order) in the class. Try to (i) derive the equations (start from mass balance equation) for a process with four non-interactive simple tanks in series as what we have done in the class, and (ii) simulate the process with Simulink. Then, (iii) elaborate an h-t figure to show the effect of input step changes from 10 to 11,10.1, 9.9 , and 9gpm. 4. We have introduced the process dynamics modeling and Simulink simulation of one simple tank (first-order) as well as two non-interactive simple tanks in series (second-order) in the class. Try to (i) derive the equations (start from mass balance equation) for a process with four non-interactive simple tanks in series as what we have done in the class, and (ii) simulate the process with Simulink. Then, (iii) elaborate an h-t figure to show the effect of input step changes from 10 to 11,10.1, 9.9 , and 9gpm