Question

A certain calling card gives the following rate to call Malaysia. There is a connection fee of $0.39 which allows you to connect for up to (but not including) one minute. For each additional minute or part of a minute, there is a $0.24 cent charge. (For example, 1 minute up to but not including 2 minutes costs $0.63.) This fare is only valid for up to (but not including) 40 minutes.

15. Express this information as a function, where f(x) represents the amount of money charged and x represents the number of minutes which have elapsed.
16. What is the domain for this function?
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?

Answer 1

f(x)=.24x+.39

f(x)=.24(19)+.39

f(x)=4.95

You would be spending $4.95.

Hope this helps!