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agillogly

  • 3 years ago

help please.

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  1. agillogly
    • 3 years ago
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  2. MrMathmatician
    • 3 years ago
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    The awnser is Deh

  3. phi
    • 3 years ago
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    |dw:1339443442759:dw| use pythagorean theorem to find the hypotenuse (length of the vector)

  4. agillogly
    • 3 years ago
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    like a^2+b^2=c^2? that would be 27.

  5. phi
    • 3 years ago
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    (-3)^2 + 6^2 = c^2 c^2= 9+36 = 45 can you find c?

  6. phi
    • 3 years ago
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    sqrt(45) which you can simplify by noticing sqrt(45)= sqrt(5*9)

  7. agillogly
    • 3 years ago
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    6.71

  8. phi
    • 3 years ago
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    But you want to use the same form that the answers are in. sqrt(45)= sqrt(5*9) can you simplify this?

  9. phi
    • 3 years ago
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    It is handy to know sqrt(a*b)= sqrt(a) * sqrt(b)

  10. agillogly
    • 3 years ago
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    [3\sqrt{5}\]

  11. phi
    • 3 years ago
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    yes. Choice A

  12. phi
    • 3 years ago
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    btw, notice that the length of the vector has to be bigger than 6 (its x component). (Lengths will always be positive). So you could eliminate choices B and D immediately.

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