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Katelyn is shopping for a cellular phone service. Trenton bell charges a monthly fee of $40 for up to 500 minutes. For every minute over 500 there is an $0.18 charge. Write a piecewise function to represent the cost of this plan

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carlosego
For this case, the first thing we must do is define variables.
 We have then:
 x: number of minutes.
 y: total cost.
 We then have a function for two different intervals.
 These intervals are:
 For [tex]0 \leq x \leq 500[/tex]:
 [tex]y = 40 [/tex]
 For [tex]x\ \textgreater \ 500[/tex]:
 [tex]y = 0.18x + 40[/tex]

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