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A shoe store developed the following estimated regression equation relating sales to inventory investment and advertising expenditures. y = 20 + 13x1 + 6x2 where 1 = inventory investment ($1000s) $2 = advertising expenditures ($1000s) y = sales ($1000s) a. Predict the sales resulting from a $15,000 investment in inventory and an advertising budget of $10,000. b. Interpret bj and by in this estimated regression equation. b1: Sales can be expected to - Select your answer - w|by $13 for every dollar increase in - Select your answer - v when - Select your answer - is held constant. 62: Sales can be expected to - Select your answer - |by $6 for every dollar increase in - - Select your answer - when - Select your answer - is held constant