If Possible, Find $3 A + 4 B$ A) $\left[ \begin{array} { c c c } 20 & - 27 & 7 \\ 9 & - 14 & 11 \end{array} \right]$

question 100

Multiple Choice

If possible, find $3 A + 4 B$ .
$$A = \left[ \begin{array} { c c c } - 4 & 3 & 9 \\3 & - 2 & 5\end{array} \right] , B = \left[ \begin{array} { c c c } - 8 & 9 & 5 \\0 & 2 & 1\end{array} \right]$$

• A) \(\left[ \begin{array} { c c c } 20 & - 27 & 7 \\ 9 & - 14 & 11 \end{array} \right]\)
• B) \(\left[ \begin{array} { c c c } - 12 & 12 & 14 \\ 3 & 0 & 6 \end{array} \right]\)
• C) \(\left[ \begin{array} { l l l } 1 & 0 & 0 \\ 0 & 1 & 0 \end{array} \right]\)
• D) \(\left[ \begin{array} { c c c } - 44 & 45 & 47 \\ 9 & 2 & 19 \end{array} \right]\)
• E) not possible

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Definitions:

Permeable Sandstone

A type of sandstone that allows fluids to pass through it due to spaces between the sand grains, making it important for water and hydrocarbon reservoirs.

Impermeable Shale

A type of shale rock so compact that it does not allow fluids to pass through it, often creating a barrier for groundwater movement.

Iron Ore

Naturally occurring rocks and minerals from which metallic iron can be economically extracted, commonly found as hematite and magnetite.

Sand, Gravel

Natural aggregate materials consisting of fine particles (sand) and coarse particles (gravel), used in construction and as soil components.