OG详解-OG1 数学1 Q3

Choice D is correct. The cost of the rental fee depends on the number of hours the surfboard is rented. Multiplying t hours by 10 dollars per hour yields a rental fee of 10t dollars. The total cost of the rental consists of the rental fee plus the 25 dollar service fee, which yields a total cost of 25 10t + dollars. Since the person intends to spend a maximum of 75 dollars to rent the surfboard, the total cost must be at most 75 dollars. Therefore, the inequality 25 10 75 t + £represents this situation.
Choice A is incorrect. This represents a situation where the rental fee, not the total cost, is at most 75 dollars. Choice B is incorrect and may result from conceptualor calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.