The diаmeter оf аn оаk trunk (y) depends оn its age (x1), height (x2) and diameter of its crown (x3). The results of measurements are as follows: Trunk Diameter, cm Age, years Height, m Crown Diameter, m 7.1 21 9.8 1.1 8.5 37 10.2 3.1 10.6 35 12.7 1.6 13.6 36 13.9 2.1 16.0 42 15.2 4.6 18.7 46 15.3 3.7 19.8 44 16.8 5.6 20.5 41 16.5 6.3 24.3 45 16.9 4.0 1. Provide the fitted regression equation. Trunk Diameter = [1] + [2]Age + [3]Height + [4]Crown Diameter (round to two decimal places) 2. Does significance of regression exist for this model? (yes or no) [6] 3. Which variables are significant predictors? (list the significant predictors in alphabetical order, separated by a comma) [5] 4. Estimate the strength achieved when Age =29, Height=12 and Crown Diameter=4 [7] (round to three decimal places)