Final answer:
Katie's situation can be represented by the inequality 0.65x + 1.70 ≤ 10.
Step-by-step explanation:
Katie's situation can be represented by the inequality 0.65x + 1.70 ≤ 10. The variable 'x' represents the number of miles Katie will travel. The expression 0.65x represents the cost of the ride based on the number of miles, and 1.70 represents the flat rate charged by Pink Cab Taxi. The inequality states that the total cost should be less than or equal to $10, which is the amount Katie has to spend.