Vector Introduction Unit Test 6 MCV4U Vectors Representation and Algebraic Operations

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CORRECTION: Q6. I found b - a instead of a -b. So, please write negative of the answer to get the correct result. Thanks
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Sir, for #5 isn't cos(phi)= -13/56, instead of -13/15? My final answer was (a+b)= 15.2

abdullah
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Thank you for responding. For some reason, I am getting (3, -2, 12) for 6!

gurmenbadyal
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For number 5, how do you know which angle is for a+b compared to a-b? and great question!

gurmenbadyal