Given vector u = (1, (3) and v = (1, -1), how are the vectors related? The vectors form an acute angle of approximately 75º.
The vectors form an acute angle of approximately 81°.
The vectors form an obtuse angle of approximately 99º.
The vectors form an obtuse angle of approximately 105°.

Its D on Edge 2020

Step-by-step explanation:

The vectors form an obtuse angle of approximately 105°.

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.