# Chapter 1 - Section 1.5 - Addition of Real Numbers - Exercise Set - Page 63: 29

$-5.7$.

#### Work Step by Step

The addends (numbers being added have) the same sign. To add two numbers with the same sign, perform the following steps: (1) Add the absolute values. $|-3.6|+|-2.1|=3.6+2.1=5.7$ (2) Use the sign of the numbers. $-3.6+(-2.1)=-5.7$ Thus, the sum is $-5.7$.

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