A shoe store developed the following estimated regression equation relating sales to inventory investment and advertising expenditures. )7 = 29 + 10xl + 8x2 where x1 inventory investment ($1,0005) x2 = advertising expenditures ($1,0005) y = sales ($1,0005). (a) Predict the sales (in dollars) resulting from a $14,000 investment in inventory and an advertising budget of $10,000. $ (b) Interpret b1 and [22 in this estimated regression equation. Sales can be expected to increase by $ for every dollar increase in inventory investment when advertising expenditure is held constant. Sales can be expected to increase by $ for every dollar increase in advertising expenditure when inventory investment is held constant