The following regression output was obtained from a study of architectural firms. the dependent variable is the total amount of fees in millions of dollars. predictor coefficient se coefficient t p-value constant 7.031 3.086 2.278 0.010 x1 0.231 0.193 1.197 0.000 x2 − 1.108 0.572 − 1.937 0.028 x3 − 0.392 0.154 − 2.545 0.114 x4 0.550 0.317 1.735 0.001 x5 − 0.057 0.025 − 2.280 0.112 analysis of variance source df ss ms f p-value regression 5 2,219.34 443.9 9.85 0.000 residual error 49 2,208.98 45.08 total 54 4,428.32 x1 is the number of architects employed by the company. x2 is the number of engineers employed by the company. x3 is the number of years involved with health care projects. x4 is the number of states in which the firm operates. x5 is the percent of the firm’s work that is health care−related. write out the regression equation.