- $\mathrm { P } _ { 1 } ( - 2,8 , - 1 )$

question 40

Multiple Choice

$\text { Calculate the direction of } \overrightarrow { P _ { 1 } P _ { 2 } } \text { and the midpoint of line segment } P _ { 1 } P _ { 2 } \text {. }$
- $\mathrm { P } _ { 1 } ( - 2,8 , - 1 )$ and $\mathrm { P } _ { 2 } ( 0,2,2 )$

• A) \(\frac { 2 } { \sqrt { 7 } } \mathbf { i } + \frac { 8 } { \sqrt { 7 } } \mathbf { j } + \frac { 1 } { \sqrt { 7 } } \mathbf { k } ; \left( - 1,4 , - \frac { 1 } { 2 } \right)\)
• B) \(\frac { 2 } { 7 } \mathbf { i } - \frac { 6 } { 7 } \mathbf { j } + \frac { 3 } { 7 } \mathbf { k } ; ( 0,1,1 )\)
• C) \(\frac { 2 } { 7 } \mathbf { i } - \frac { 6 } { 7 } \mathrm { j } + \frac { 3 } { 7 } \mathbf { k } ; \left( - 1,5 , \frac { 1 } { 2 } \right)\)
• D) \(\frac { 2 } { \sqrt { 7 } } \mathbf { i } - \frac { 6 } { \sqrt { 7 } } \mathbf { j } + \frac { 3 } { \sqrt { 7 } } \mathbf { k } ; \left( - 1,5 , \frac { 1 } { 2 } \right)\)

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