A valve on a storage tank is opened for 4 hours to release a chemical in a manufacturing process. The flow rate R (in liters per hours) at a time t (in hours) is given in the table. t 0 1 2 3 4 R 426 240 120 69 38 (a) Use the linear regression capabilities of a graphing utility to find a linear model for the points (t, In(R)). Write the resulting equation of the form In(R) = at + b in exponential for places.) R = X (b) Use a gr