Question: how to solve 55. A continuous function y = f(z) is known to be negative at z = 0 and positive at z = 1.

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55. A continuous function y = f(z) is known to be negative at z = 0 and positive at z = 1. Why does the equation f(z) = 0 have at least one solution between z = 0 and z = 1? Illustrate with a sketch

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