Practice problem
Let x⃗=[155]\vec{x} = \begin{bmatrix} 1 \\ 5 \\ 5 \end{bmatrix}x=155 and y⃗=[942]\vec{y} = \begin{bmatrix} 9 \\ 4 \\ 2 \end{bmatrix}y=942.
What is x⃗⋅y⃗\vec{x} \cdot \vec{y}x⋅y?
10
20
39
45
Type a concept, like “slope” or “photosynthesis”.
