List of magazines by circulation - Alchetron, the free social encyclopedia

The circulation C of a certain magazine as a function of time t is given by the formula C=(5.2)/(0.1 0.3^t) . Here C is measured in thousands, and t is measured in years since the beginning of 1992 , when the magazine was started. a. Make a graph of C versus t covering the first 6 years of the magazine's existence. b. Express using functional notation the circulation of the magazine 18 months after it was started, and then find that value. c. Over what time interval is the graph of C concave up?

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