# Chapter 6 Rational Exponents and Radical Functions - 6.4 Use Inverse Functions - 6.4 Exercises - Quiz for Lessons 6.3-6.4 - Page 445: 19

See below.

#### Work Step by Step

$C(g(d))=C(0.02d)=2.15(0.02d)=0.043d$. Thus using this formula: $C(g(400))=0.043(400)=17.2$ $C(g(d))$ represents the cost of gasoline used by a car.

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