12-

pls help

math

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c

Step-by-step explanation:

Easiest way is drawing the vectors.

If you need a better reason you can get it through dot product.

Let X be the angle needed.

Dot product of two vectors is defined as

A •B = |A||B|cosX

where X is the angle between A and B

cosX=A•B/ |A||B|

=(-1×-9+1×0) / (√(-1^2+1^2)×√(-9^2))

=1/√2

So the answer is X=45°

your answer would be 10x - 1

use google you idiot omg you're so annoying

step-by-step explanation: