Let v = (5, - 2) and w = (-10, 4). Which of the following is true?

I am not sure exactly what you mean but here it goes;

(5, - 2) (-10, 4)

we will use the following formula to determine the slope;

y2 - y1/x1-x2

4 - (-2 / 5 - (-10 = - 2/-5 = 2.5

The slope would be 2.5, hope that answers it for ya.

On Apex:

Correct Answers are - The y-component of w is 4; w=-2v; and v+w=-58.

Not Correct - v and w are perpendicular