Question: Question 4 (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)

Question 4 (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? O a) about 4 km/h O b) about 5 km/h c) about 3 km/h O d) about 2 km/h

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