## Elementary Algebra

Published by Cengage Learning

# Chapter 11 - Additional Topics - Chapter 11 Review Problem Set - Page 520: 83

#### Answer

The math is below, and the graph is attached.

#### Work Step by Step

We plug in the given values of x into the equation to find: A) $f(50) = 12 + .2(50) = 22$ B) $f(100) = 12 + .2(100) = 32$ C) The graph is attached. D) In order to estimate, first draw a vertical line at t=80. Then, estimate the value of f(x) at the intersection. This value is 28 gallons. After all: $f(80) = 12 + .2(80) = 28$

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