1.

The triangle ABC is defined by the vertices A =(0,7,10), B = (-1,6,6) and C = (-4,9,6) Let D be the foot of the altitude from B to the side AC. Then bar(BD) is

Answer»

`bari+2barj+2bark`
`-bari+2barj+2bark`
`2bari+barj+bark`
`2bari-barj-bark`

ANSWER :B


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