Solve each problem.
Distance to Lightning When a bolt of lightning strikes in the distance, there is often a delay between seeing the lightning and hearing the thunder. The function defined by computes the approximate distance in miles between an observer and a bolt of lightning when the delay is x seconds. (Source:Weidner, R., and R. Sells, Elementary Classical Physics, Allyn and Bacon, Inc.)
(a) Find ƒ(15) and interpret the result.
(b) Graph y = ƒ(x). Let the domain of ƒ be [0, 20].
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