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Question 19 (1 point) Which of the following quadratic functions will have a minimum value? Oh(x) = - 3(x +4)2 + 8 O g(x) = - 5x2 + 3x + 7 Ax) = 2x2 + 9x - 13 Oy=-(x-6)2 - 15 Question 20 (1 point) The cost, c(x), in dollars per hour of running a trolley at an amusement park is modelled by the function c(x) = 2.1x2 - 12.7x + 167.4, where x is the speed in kilometres per hour. At what approximate speed should the trolley travel to achieve minimum cost? about 2 km/h about 3 km/h about 4 km/h O about 5 km/h Question 21 (1 point) The demand function for a new CD is p(x) = -4x+ 24 where p(x) represents the selling price, in thousands of dollars, and x is the number of CDs sold, in thousands. What is the maximum revenue? Revenue = [p(x)](x) $3000 $20 000 $24 000 $36 000Question 22 (1 point) What is the minimum value for the function f(x) = 4x3 - 8x + 16? O - 12 O 1 O 12 O 16 Question 23 (1 point) The demand function for a new comic book is p(x) = -5x + 30 where p(x) represents the selling price, in thousands of dollars, and x is the number of comic books sold, in thousands. What is the maximum revenue? Revenue = [p(x)](x) $30 000 O $40 000 O $45 000 O $50 000