Let v=(8,-4) and w = (-4,2). Which of the following is true? Check all that apply

A. v=-2w
B. The x-component of v is 4
C. The y-component of w is 2
D. V*w=40

I think its C and D but im not sure please help!

Question

Let v=(8,-4) and w = (-4,2). Which of the following is true? Check all that apply

A. v=-2w
B. The x-component of v is 4
C. The y-component of w is 2
D. V*w=40 

I think its C and D but im not sure please help!

anonymous · Answer

Let's test the first option.

v=-2w
v=-2(-4, 2)
v=((-2)(-4), (-2)(2))
v=(8, -4)

So option A is true.

anonymous · Answer

I believe you are correct with option C.

anonymous · Answer

Oh i see so answer is A,C? is D in correct?

anonymous · Answer

Never mind i got it! V*w would equal -40

anonymous · Answer

Sorry, I lost my internet last night :/ But yes, good job! :)