Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 2 - Section 2.3 - Solving Linear Equations - Exercise Set - Page 144: 111


The expression is evaluated to $-10$.

Work Step by Step

This expression can be evaluated starting from the left and proceeding to the right because the only operations found in this expression are addition and subtraction, which should be evaluated in order from left to right. We first add $-9$ to $-11$ to get: $$-20 + 7 - (-3)$$ Then add $7$ to get: $$-13 - (-3)$$ To subtract a negative number, you actually add the number because a negative and a negative equals a positive: $$-13 + 3$$ The expression is evaluated to $-10$.
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