Cost: Hard Drive Storage Exercises 49 and 50 are based on the followin...

Cost: Hard Drive Storage Exercises 49 and 50 are based on the following data showing how the approximate retail cost of a gigabyte of hard drive storage has fallen since 2000:

a. Graph each of the following models together with the data points above and use your graph to decide which three of the models best fit the given data:

b. One of the three best-fit models in part (a) gives an unreasonable prediction for the price in 2020. Which is it, what price does it predict, and why is the prediction unreasonable?