S(x) = -x3 - 9x" + 165x + 1300, 5 x 20 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon. O A. 20 C O B. 6C OC. 19 C O D. 5 CFind two numbers x and y such that their sum is 540 and x y is maximized. O A. x =405, y =135 O B. x=360, y = 180 O C. x = 135, y =405 O D. x = 180, y =360A rectangular field is to be enclosed on four sides with a fence. Fencing costs $5 per foot for two opposite sides, and $2 per foot for the other two sides. Find the dimensions of the field of area 670 ft that would be the cheapest to enclose. O A. 41 ft @ $5 by 16.4 ft @ $2 O B. 64.7 ft @ $5 by 10.4 ft @ $2 O C. 10.4 ft @ $5 by 64.7 ft @ $2 O D. 16.4 ft @ $5 by 41 ft @ $2be charged in order to maximize revenue? A baseball team is trying to determine what price to charge for tickets. At a price of $10 per ticket, it averages 40,000 people per game. For every increase of $1, it loses 5,000 people. Every person at the game spends an average of $5 on concessions. What price per ticket should O A. $3.00 O B. $13.50 O C. $6.50 O D. $3.50From a thin piece of cardboard 40 in by 40 in, square corners are cut out so that the sides can be folded up to make a box. What dimensions will yield a box of maximum volume? What is the maximum volume? Round to the nearest tenth, if necessary. O A. 13.3 in by 13.3 in by 13.3 in.; 2,370.4 in3 B. 20 in by 20 in by 10 in; 4,000 in3 O C. 26.7 in by 26.7 in by 6.7 in; 4,740.7 in3 O D. 26.7 in by 26.7 in by 13.3 in; 9,481.5 in3