The vectors i and j both have magnitudes of 1 and are called vectors. the direction of vector i is along the positive . the direction of vector j is along the positive .

Answers:

a) Unit

b) X

c) Y

Explanation:

a) Let´s imagine you count the vectors as if they were apples, in this case if you have 1 apple you could say you have an apple unit.  

It´s the same with the vectors, as both magnitudes are 1 they can be called unit vectors.

b) and c) Also, when you´re referring to vectors they could have different values in different axis, in this case, when we talk about the i vector we´re referring to it´s value along the positive X axis, when we talk about the j vector we´re referring to it´s value along the positive Y axis. The same happens if we talk (for example) about the -i vector, so we will be saying it´s along the negative X axis.

If you´re working in a 3 dimensions plane you will have another axis called Z, it can be noted with k and behaves the same as i and j

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i hope that this ! : d

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step-by-step explanation: