Answer
-30
Work Step by Step
Replace r with -1.
Replace s with -7.
2(-1) + 4(-7)
Using the order of operations, do all multiplications first. Then addition.
= (-2) + (-28)
Now, change addition to subtraction.
=-2-28
= -30
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - 9.5 Evaluating Expressions and Formulas - 9.5 Exercises - Page 660: 7
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