Acertain calling card gives the following rate to malaysia. there is a connection fee of $0.39 which allows you to connect for up to (but not including) a minute. for each additional minute or part of a minute, there is a $0.24 cent charge. (for example, for 1 minute up to but not including 2 minutes costs $0.63.) you need to make a 20 minute call.

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.