tolong jawabannya dengar benar ya, soalnya mau dikumpulkan. terima kasih

1 & 2 gampang itu
3.
[tex]6i - j + k + - i + 5j + 3k = 5i + 4j + 4k[/tex]
4.
[tex]3(6i - j + k) - i + 5j + 3k = 18i - 3j + 3k - i + 5j + 3k = 17i + 2j + 6k[/tex]
5.
[tex] - 5(6i - j + k) - ( - i + 5j + 3k) = - 30i + 5j - 5k + i - 5j - 3k = - 29i - 8k[/tex]
6.
[tex] \sqrt{ {6}^{2} + { (- 1)}^{2} + {1}^{2} } = \sqrt{36 + 1 + 1} = \sqrt{38} [/tex]