Question

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

Answer 1

clearly, one piece is

f(x) = 15.00 for 0 ≤ x ≤ 60
so, what is the second piece? check out the ceiling (or least-integer) function