A certain phenomenon has initial value 8 and decays by 11% each year. Give an exponential function that describes this phenomenon using variable t for time in years

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter5: Exponential And Logarithmic Functions
Section5.5: Exponential And Logarithmic Models
Problem 2ECP
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A certain phenomenon has initial value 8 and decays by 11% each year. Give an exponential function that describes this phenomenon using variable t for time in years.

a) 8 x 11^t
b) 0.11 x 8^t 
c) 0.89 x 8^t
d) 8 x 0.89^t

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