Chapter 1, Equations and Inequalities - 1.1 Applying Properties of Real Numbers - 1.1 Exercises - Skill Practice - Page 6: 21

The statement is true.

Work Step by Step

$7a+(4+5a)=7a+(5a+4) \qquad$(commutative property of addition) $=(7a+5a)+4\qquad$(associative property of addition) $=(7+5)a+4\qquad$(distributive property of addition) $=12a+4\qquad$(simplify 7+5) (LHS = RHS) The statement is true.

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