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

question 69

Multiple Choice

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

• A) \(\mathrm { AB }\) is \(2 \times 4 , \mathrm { BA }\) is \(4 \times 2\).
• B) \(\mathrm { AB }\) is \(2 \times 2 , \mathrm { BA }\) is \(4 \times 4\).
• C) \(A B\) is undefined, \(B A\) is undefined.
• D) \(\mathrm { AB }\) is \(4 \times 2\), \(\mathrm { BA }\) is \(2 \times 4\).

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Definitions:

Larynx

The voice box, located in the throat, which contains the vocal cords and is involved in breathing, producing sound, and protecting the trachea.

Glottis

The part of the larynx consisting of the vocal cords and the slit-like opening between them, involved in producing vocal sounds.

Epiglottis

A leaf-shaped flap of cartilage located behind the tongue, which closes over the windpipe during swallowing to prevent food from entering the airways.

Vocal Folds

Vocal folds, also known as vocal cords, are muscular structures in the larynx that vibrate to produce sound when air is expelled from the lungs, facilitating speech and singing.