A certain telephone company charges $0.10 for the first minute of a long-distance call and $0.07 for each additional minute or fraction thereof. If C is the cost of a call and x is the length of the call in minutes, find the cost as a function of x, and skethch a graph. Assume that x <= 3. Find any points of discontinuity. Would these points affect your behavior?   The function I came up with is f(x) = (x*60-60)/60(.07)+.10... Does that work? I'm confused on how to find points of discontinuity however.

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