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A tank contains 30 liters of water at time t = 5 hours. Water is being pumped into the tank at a rate of R(t) where R(t) is measured in liters per hour, and t is measured in hours. Selected values of R(t) are given in the table. Using a right Riemann sum with four subintervals and data from the table, what is the approximation of the number of liters of water that are in the tank at time t = 19 hours?






