OG详解-OG1 数学2 Q2

Choice D is correct. It′s given that Juan rides his bike at an average rate of 5.7 minutes per mile. The number of minutes it will take Juan to ride x  miles can be determined by multiplying his average rate by the number of miles, x , which yields 5.7x. Therefore, the function m(x)= 5.7x  models the number of minutes it will take Juan to ride x miles. Choice A is incorrect and may result from conceptual errors. Choice B is incorrect and may result from conceptual errors. Choice C is incorrect and may result from  conceptual errors.