1/4÷2\3 hour as a unit rate

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Is this a polynomial function? i need to know asap

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?