The Sizes of Two Matrices a and B Are Given $A$

question 26

Multiple Choice

The sizes of two matrices A and B are given. Find the sizes of the product AB and the product BA, whenever these
products exist.
- $A$ is $4 \times 2$ , and B is $4 \times 2$ .

• A) \( 2 \times 4 ; 4 \times 2 \)
• B) \( \mathrm{AB} \) does not exist; \( \mathrm{BA} \) does not exist.
• C) \( 4 \times 4 ; 2 \times 2 \)
• D) \( 4 \times 2 ; 2 \times 4 \)

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Definitions:

Slow-To-Warm-Up Temperament

A temperament style in children who typically show mild reactions to their environment and new experiences and take longer to adjust to new situations.

Easy Temperament

A temperament characterized by a positive mood, regular bodily functions, and adaptability; children with this temperament generally show low or moderate intensity of reaction and a high level of self-regulation.

Difficult Temperament

A behavioral profile in children characterized by high reactivity, poor adaptability, and a tendency toward negative emotions.

Quiet Infant

A term referring to a baby who is typically less vocal or active, displaying calmness and minimal fussiness.