Answer
$D_{1r}: d_{r}$
Dimension: 1$\times$n
Work Step by Step
The r in $D_{1r}$ means that it can be any variable in the single row matrix, so $D_{1r}= d_{r}$.
There is 1 row and n columns, so the dimension is 1$\times$n.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 4 - Section 4.1 - Matrix Addition and Scalar Multiplication - Exercises - Page 239: 9
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