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Mathematics 8 Online
OpenStudy (anonymous):

Help with a unit vector problem please! I always Medal :)

OpenStudy (anonymous):

OpenStudy (anonymous):

OpenStudy (anonymous):

Question 6 number 3 is what I need help with as I do not understand why the final answer must be divided by seven

OpenStudy (anonymous):

a unit vector has a length (magnitude) of 1. So if you found AB, find its magnitude and divide.

OpenStudy (anonymous):

AB = 2i + 3j + 6k => |AB| = sqrt(2^2 + 3^2 + 6^2) = sqrt(4 + 9 + 36) = sqrt(49) = 7

OpenStudy (anonymous):

Thanks a lot!

OpenStudy (anonymous):

you're welcome!

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