Answer
$-61$
Work Step by Step
Step 1: $\langle -3,8 \rangle \cdot \langle 7,-5 \rangle$
Step 2: $-3(7)+8(-5)$
Step 3: $-21-40)$
Step 4: $-61$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 7 - Applications of Trigonometry and Vectors - Section 7.4 Vectors, Operations, and the Dot Product - 7.4 Exercises - Page 331: 72
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