Question 397767
The position vector <-17, 11, -4> or -17i + 11j - 4k has length {{{sqrt((-17)^2 + 11^2 + (-4)^2 )= sqrt(426)}}}.  The direction cosines are then
{{{-17/ sqrt(426)}}}, {{{11/ sqrt(426)}}}, {{{-4/ sqrt(426)}}}.
Incidentally, the answer is d, none of the choices.