1. (4 points) Which of the following straight lines is perpendicular to the velocity vector of the path 7(t) = (319,225 + 1, |t|) at
1. (4 points) Which of the following straight lines is perpendicular to the velocity vector of the path 7(t) = (319,225 + 1, |t|) at (3, 1, 1)? (a) (1,2,-1)8 (b) (1,4,2)s (6) (1,3,0)8 (d) (0,0,1)s
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