(Solved): please help me, thank you The point A with position vector a=431 o ...

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The point $$A$$ with position vector $$\vec{a}=\left[\begin{array}{c}4\\ ?3\\ 1\end{array}\right]$$ on the line $$?$$ with vector equation The position vector $$\vec{s}$$ of the point on $$?$$ that is closest to $$A$$ is and the distance between the point $$A$$ and the line is (Note: sqrt $$(k)$$ gives the square root of the number $$k$$.)