For questions 15-19, use the following information. A certain calling card gives the following rate to call Malaysia. There is a connection fee of $0.39 allows you to connect for up to (but not including) one minute. For each additional minute or part minute, there is a $0.24 charge. (For example, 1 minute up to but not including 2 minutes costs $0 This fare is only valid for up to (but not including) 40 minutes. P 15. Express this information as a function, where f(x) represents the amount of money charged represents the number of minutes which have elapsed. f(x= 24x +39 f(x 24 (19) +39 Rx) = $4.95 16. What is the domain for this function? [0,40) 17. What is the range for this function? 18. What is f(2.5)? What does this value represent in the context of the problem? 19. Is this function one-to-one? How do you know? SP AW Page 5 /7

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