Answer
$$\sqrt{26}.$$
Work Step by Step
First, we have $$\overrightarrow{ OR}=R-O=(1,4,3)-(0,0,0)=\langle 1,4,3 \rangle.$$
Now,
$$\|\overrightarrow{ OR}\|=\sqrt{1+16+9}=\sqrt{26}.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.2 Vectors in Three Dimensions - Exercises - Page 659: 9
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