(1 point) A retail store estimates that weekly sales 5 and weekly advertising costs 3: (both in dollars) are related by s = 70000 4300005000071\". The current weekly advertising costs are 2000 dollars and these costs are increasing at the rate of 300 dollars per week. Find the current rate of change of sales. Rate of change of sales = (1 point) A baseball diamond is a square with sides of length 90 ft. A batter hits the ball and runs toward first base with a speed of 26 ft/s. At what rate is his distance from second base changing when he is halfway to first base? Answer = ft/s At what rate is his distance from third base changing at the same moment? Answer = ft/s