We are interested in investigation the relationship between the sales volume of a company (y in millions of dollars) with two independent variables, advertising expenditures (x, in millions of dollars) and the number of salespeople (x2), Data over the past 10 years were collected. Part of the Excel output is shown below. Estimate the sales volume for an advertising expenditure of 3.5 million dollars and 45 salespeople. Give your answer in dollars. ANOVA df SS MS F Regression 321.11 Residual 63.39 Coefficients Standard Error Intercept 7.0174 1.8972 X1 8.623B 2.3968 X2 0.0858 0.1845