A valve on a storage tank is opened for 4 hours to release a chemical in a manufacturing process. The flow rateR(in liters per hours) at a timet(in hours) is given in the table.

t |0 |1 |2 |3 |4

R | 423 |239 |120 |70 |36

(a) Use the linear regression capabilities of a graphing utility to find a linear model for the points(t, ln(R)).Write the resulting equation of the form ln(R) =at+bin exponential form. (Round your coefficients to four decimal places.)