# calculus

A glacier covered about 130 acres in 2003 and was shrinking at a rate of about 4.8% per year.

(a) Write a formula for the size, S, of the glacier, in acres, as a function of years t since 2003.

b) Use the model to predict the size of the glacier in the year 2009.

c) According to the model, how many acres of ice were lost from the glacier between 2003 and 2008?

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1. this is just another exponential function.
S = 130(1+0.048)^t

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oobleck
2. but shrinking not growing - use - sign
S = 130(1-0.048)^t

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