'aJ J\\lJ Advertising Costs A retail sporting goods store estimates that weekly sales S and weekly advertising costs x are related by the equation S = 2290 + 90x + 0.25x2. The current weekly advertising costs are $1800, and these costs are increasing at a rate of $125 per week. Find the current rate of change of the weekly sales with respect to time. $1 I_ per week ' Enter an exact number. Need Help? Submit Answer 6. [-I10 Points] LARAPCALC1O 2.8.025.MI. ASK YOUR TEACHER PRACTICE ANOTHER Sales The prot for a product is increasing at a rate of $5800 per week. The demand and cost functions for the product are given by p = 7000 25X and C = 2000x + 54, where x is the number of units produced per week. Find the rate of change of sales with respect to time when the weekly sales are X = 71 units. [:] units per week