Cellular Phone Bills Suppose that the charges for an international cellular phone call are $0.50 for the first minute and $0.25 for each additional minute. Assume that a fraction of a minute is rounded up.
(a) Determine the cost of a phone call lasting 3.5 minutes.
(b) Find a formula for a function ƒ that computes the cost of a telephone call x minutes long, where 0 < x ≤ 5.
(Hint: Express ƒ as a piecewise-defined function.)
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