The relationship between men’s whole-number shoe sizes and foot lengths is an arithmetic sequence, where A sub n is the foot length in inches that corresponds to a shoe size of n A men’s size 9 fits a foot 10 point 3 1 inches long, and a men’s size 13 fits a foot 11 point 7 1 inches long. What is the explicit formula for the arithmetic sequence? Round to the nearest hundredth, if necessary.