suppose that a cell phone plan charges $15.00 for the first 60 minutes or less used in a month and $0.50 for each additional minute or portion of a minute. Write a piecewise function that shows the charges for time t where t ranges from 0 to 63 minutes
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1 answer

clearly, one piece is
f(x) = 15.00 for 0 ≤ x ≤ 60
so, what is the second piece? check out the ceiling (or leastinteger) function 👍
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answered by oobleck
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