A biologist wants to predict the trunk diameter, y, in inches of a certain species of tree, given its height in feetx1, its age,x2, in years, and the average annual precipitation, x3, in inches. She obtains the regression equation y=5.12+0.147x1+0.029x2+0.039x3. Predict the trunk diameter of a 58-year-old tree that is 73 feet tall, in a region that receives an average of 80 inches of precipitation per year. Round to one decimal place.