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the average cost of online photos decreases from 0.50 per print to $0.15 per print between 2002 and 2009. Find the average rate of change in the cost. Explain what it means

Respuesta :

carlosego
The average rate of changeis given by:
 m = (y2-y1) / (x2-x1)
 m = (0.50-0.15) / (2002-2009)
 Rewriting:
 m = (0.35) / (- 7)
 m = -0.05 $ / year
 Answer:
 the average rate of change in the cost is:
 m = -0.05 $ / year
 It means that the cost per print decreases 0.05 $ per year

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