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Given the limitations of the browser through which you post questions, it is virtually impossible to be certain. From what I can see and what I can guess, the most likely candidate isa(x) = 1.5*0.85^x.

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Q: Which of the following functions is an example of exponential growth A. a(x) 1.50(0.85)x B. b(x) 4.07x13 C. c(x) 0.5(2?
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