Answer
columns, rows.
Work Step by Step
If the dimensions of matrix A are $a\times b$ and the dimensions of matrix C are $c\times d$, then AC is defined if $b=c$ and then AC has dimensions $a\times d.$
Thus the missing words are: columns, rows.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 3 Linear Systems and Matrices - 3.6 Multiplying Matrices - 3.6 Exercises - Skill Practice - Page 199: 1
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