Show that for any arrow, you can pick an axis such that the projection of the arrow on that axis is zero. How many such axes are there?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.1: Rectangular Coordinate Systems
Problem 21E
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Show that for any arrow, you
can pick an axis such that the projection of the arrow on that axis
is zero. How many such axes are there? 

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