Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 4 - An Introduction to Functions - Common Core Cumulative Standards Review - Selected Response - Page 288: 3


Answer choice $C$: Positive real numbers

Work Step by Step

Let's use process of elimination. You can eliminate answer choice $D$, because "All real numbers" includes negative numbers, and for a circle, the circumference cannot be negative. You can also eliminate answer choice $A$, and answer choice $B$, because not only integers can be the radius, but any positive real number, like fractions and decimals, can be the radius. The domain can only be real numbers that are positive. The answer is $C$
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