# Chapter 1 - Foundations for Algebra - 1-6 Multiplying and Dividing Real Numbers - Practice and Problem-Solving Exercises - Page 42: 21

13

#### Work Step by Step

We recall that 13 to the second power is 13$\times$13, which equals 169. Thus, we find: $\sqrt {169} = \sqrt {13 \times 13} =\sqrt {13^{2}}=13$

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