Question 1204a

Vectors I: Basics, Dot and Cross Products
Lengths of Projection

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Given the vectors a=(418){\mathbf{a}=\begin{pmatrix} 4 \\ - 1 \\ 8 \end{pmatrix}} and b=(1250),{\mathbf{b}=\begin{pmatrix} 12 \\ 5 \\ 0 \end{pmatrix},} what is the length of projection of b{\mathbf{b}} onto a?{\mathbf{a}?}

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