Pics included! will give brainliest! show work and explain

I assume you know about the dot product, and that for two vectors and , the angle between them satisfies

Then the vectors are parallel if the angle between them is 0 or 180 degrees (0 or pi radians), which would make or , respectively.

Part A)

Then the angle between is such that

so these vectors are parallel ("antiparallel", more specifically, which means they are parallel but point in opposite directions).

Part B) involves the same computations:

has the same components but differing by sign and order, as ; its magnitude remains the same, though:

which is neither 0 nor pi, which means these vectors are not parallel.

step-by-step explanation: step 3 should really go to step seven, but anyway never mind.

1 ∠oln ≅ ∠lno

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled