Write the Matrix in Reduced Row-Echelon Form $\left[ \begin{array} { c c c c } 7 & - 5 & 4 & 1 \\- 7 & 3 & - 2 & 21 \\8 & 2 & 3 & - 53\end{array} \right]$

question 22

Multiple Choice

Write the matrix in reduced row-echelon form. $\left[ \begin{array} { c c c c } 7 & - 5 & 4 & 1 \\- 7 & 3 & - 2 & 21 \\8 & 2 & 3 & - 53\end{array} \right]$

• A) \(\left[ \begin{array} { l l l l }
• 1 & 0 & 0 & 0 \\
• 0 & 1 & 0 & 0 \\
• 0 & 0 & 1 & 0
• \end{array} \right]\)
• B) \(\left[ \begin{array} { c c c c }
• 1 & 0 & 1 & - 7 \\
• 0 & 1 & 0 & 5 \\
• 0 & 0 & 1 & - 6
• \end{array} \right]\)
• C) \(\left[ \begin{array} { c c c c }
• 1 & 0 & 0 & - 8 \\
• 0 & 1 & 0 & - 5 \\
• 0 & 0 & 1 & 5
• \end{array} \right]\)
• D) \(\left[ \begin{array} { c c c c }
• 1 & 0 & 0 & - 7 \\
• 0 & 1 & 0 & - 6 \\
• 0 & 0 & 1 & 5
• \end{array} \right]\)
• E) \(\left[ \begin{array} { l l l l }
• 1 & 0 & 0 & 1 \\
• 0 & 1 & 0 & 1 \\
• 0 & 0 & 1 & 1
• \end{array} \right]\)

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Definitions:

Cervical

Relating to the cervix, the lower part of the uterus that opens into the vagina, or relating to the neck region of the spine.

Thoracic

Relating to the thorax or chest region of the body, encompassing the rib cage and organs contained within this area, including the heart and lungs.

Crossed Extensor Reflex

The crossed extensor reflex is a reflex action that involves the contraction of muscles opposite to the side of a painful stimulus to maintain balance and posture.

Tack

A small, sharp, pointed nail, often used for fastening materials.