Q
QuestionArt

What is the dot product of 2i+ 4j+ 5k and 3i+ 2j+k?
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Answer

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Step 1
: Recall the definition of the dot product.

\vec{a} \cdot \vec{b} = a\_1b\_1 + a\_2b\_2 + a\_3b\_3

Step 2
: Identify the components of the vectors given in the problem.

\vec{b} = 3\vec{i} + 2\vec{j} + \vec{k}
We have: and

Final Answer

\boxed{\vec{a} \cdot \vec{b} = 19}.