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anonymous

  • one year ago

let v=(2, 8) and w=(-1, -4) which of the following is true? A) The x-component of v is 2 B) v and w are perpendicular C) v*w=-34 D)v=-2w (Check all that apply)

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  1. jhonyy9
    • one year ago
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    than you know that the coordinats of a point p you write in form of p=(x,y) - so you see that for point v these coordnates are x= ? and y= ? than how you think what is true ?

  2. anonymous
    • one year ago
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    @graciecohen what is the dot product of those two vectors?

  3. anonymous
    • one year ago
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    I have no idea of the answers and this is all they gave me

  4. anonymous
    • one year ago
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    are you familiar with what a dot product is?

  5. anonymous
    • one year ago
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    the dot product is -34 I think

  6. anonymous
    • one year ago
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    yes thats correct

  7. anonymous
    • one year ago
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    so assuming v*w means the dot product of v and w then you know that choice c is correct

  8. anonymous
    • one year ago
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    looking at what @jhonyy9 wrote , can you tell if A is true or false?

  9. anonymous
    • one year ago
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    true?

  10. anonymous
    • one year ago
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    yep, so you know a and c are both true, lets look at b

  11. anonymous
    • one year ago
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    if two vectors are perpendicular what does their dot product equal?

  12. anonymous
    • one year ago
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    google it if you arent sure

  13. anonymous
    • one year ago
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    orthogonal is perpendicular by the way

  14. anonymous
    • one year ago
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    @graciecohen what do you think?

  15. anonymous
    • one year ago
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    0

  16. anonymous
    • one year ago
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    so its not perpendicular

  17. anonymous
    • one year ago
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    correct

  18. anonymous
    • one year ago
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    so we have a = true, b = false, c = true, what about d?

  19. anonymous
    • one year ago
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    what is -2w equal to?

  20. anonymous
    • one year ago
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    d is true

  21. anonymous
    • one year ago
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    correct

  22. anonymous
    • one year ago
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    a = true b = false c = true d = true

  23. anonymous
    • one year ago
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    thank you so much

  24. anonymous
    • one year ago
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    yw

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