Basic College Mathematics (10th Edition)

Published by Pearson
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Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 641: 100

Answer

a) $-18,20,-5,4$ Zero does not affect the addition b) $2,-10,-3,7$ Zero does not affect the subtraction

Work Step by Step

a) $$-18 + = -18$$ $$20 + 0 = 20$$ $$0+(-5) = -5$$ $$0+4 = 4$$ Zero does not affect the addition. b) $$2-0 = 2$$ $$0-10 = -10$$ $$-3-0=-3$$ $$0-(-7) = 7$$ Zero does not affect the subtraction.
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