# Chapter 4 - Exponential Functions - 4.1 Introduction to the Family of Exponential Functions - Exercises and Problems for Section 4.1 - Exercises and Problems - Page 145: 15

$$(1.28)^t$$

#### Work Step by Step

We first find that: $$1+r=1.28$$ Thus, using the exponential growth equation: $$(1.28)^t$$

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