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Let's denote the number of rides Daniel can go on as "r".The admission to the fair is$4, and the cost of each ride is$1.50.So, the total cost of the rides can be expressed as1.50r.Since Daniel had$25to spend, we can write the inequality:4 + 1.50r ≤ 25This inequality represents that the sum of the admission fee ($4) and the cost of the rides (1.50r) should be less than or equal to$25....