Algebra 1: Common Core (15th Edition)

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

Chapter 1 - Foundations for Algebra - 1-3 Real Numbers and the Number Line - Practice and Problem-Solving Exercises - Page 21: 60



Work Step by Step

0.1 is equal to $\frac{10}{100}$. We now must write 2 in terms of a fraction with a denominator of 100. $\frac{200}{100}$ equals 2, so we add $\frac{200}{100}$ and $\frac{10}{100}$ to obtain our answer of $\frac{210}{100}$ (which can be simplfied to $\frac{21}{10}$). Because this number can be written as a fraction, it is rational.
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