Can you help me with #23?

MLR Problems 19-24: In a recent experiment to determine the factors affecting tensile strength of steel plates, the Summary of Fit tensile strength (in kg/mm?), the manganese content (in parts per thousand), and the thickness (in mm) were RSquare 0.86221 measured in a random sample of 20 plates. RSquare Adj 0.845999 Root Mean Square Error 0.822761 Mean of Response 48.525 Observations (or Sum Wgts) 20 I Analysis of Variance Use the MLR JMP output on page 7 for problems 22-26 Sum of 23. What is the least squares line for predicting tensile strength of steel plates when predicted using Source DF Squares Mean Square F Ratio Model 2 72.009591 36.0048 53.1879 Manganese and Thickness? Error 17 11.507909 0.6769 Prob > F C. Total 19 83.517500 <.0001 i parameter estimates term estimate std error t ratio prob> /t| Intercept 26.640804 2.723354 9.78 <.0001 manganese thickness interpret b2 in the context of this>