10) The ratio of working-age population to the elderly in a certain country is given by: It + 11 if 0 ≤ t < 4 f(t) 0.5t²3 15 with t = 0 corresponding to the beginning of 1995 a) Sketch the graph of f(t). b) What will the ratio be at the start of 2000? c) Over what years is the ratio constant? if 4 < t < 6 if t≥ 6

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