B) Using correct units, explain the meaning of integral from 19 to 19.9 (pi r^2 dh) in the context of the problem. Use a midpoint Riemann sum with two subintervals indicated by the data in the table to approximate. c) From t=23 to t=25 days, periods of rain occur that result in water being added to the cistern. The total amount of water, in cubic meters, that has accumulated in the cistern after t days is modeled by the function W, given by W(t)=0.598e^0.1t for 23<=t<=25 days. Find the value of integral from 25 to 23 W’(t)dt and explain its meaning in context of the problem. Show the work that leads to your answer and indicate units of measure.