Answer
$-61$
Work Step by Step
$\langle -3,8 \rangle$.$\langle 7,-5 \rangle $=$-3\times 7+8\times{(-5)}=-21-40=-61$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 7 - Applications of Trigonometry and Vectors - Section 7.5 - Applications of Vectors - 7.5 Exercises - Page 343: 48
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