Answer
10
Work Step by Step
|u x v|=|u||v|sin30 °=4·5·$\frac{1}{2}$=10
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 9 - Section 9.5 - The Cross Product - 9.5 Exercises - Page 665: 14
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