Answer
3 rows
Work Step by Step
In general, the matrix product $BC$ has the same number of rows as $B$ and the same number of columns as $C$. Since $BC$ is $3\times 4$, the matrix $B$ must have $3$ rows.
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 2 - Matrix Algebra - 2.1 Exercises - Page 102: 8
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