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anonymous

  • one year ago

check my answer plz? State whether the given measurements determine zero, one, or two triangles. A = 36°, a = 3, b = 9 I got zero

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  1. mathstudent55
    • one year ago
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    Correct.

  2. anonymous
    • one year ago
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    Thank you! Can you also check two more questions for me?

  3. anonymous
    • one year ago
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    1. Determine whether the vectors u and v are parallel, orthogonal, or neither. u = <1, -2>, v = <-4, 8> I got Neither. 2. Evaluate the expression. r = <9, -7, -1>, v = <2, 2, -2>, w = <-5, -2, 6> v ⋅ w I got <-10, -4, -12>

  4. mathstudent55
    • one year ago
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    As you can see, a = 3 is too small to make a triangle. |dw:1439433596024:dw|

  5. anonymous
    • one year ago
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    Yes, a was 3 and b was 9 as indicated int he question

  6. mathstudent55
    • one year ago
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    |dw:1439433919847:dw|

  7. mathstudent55
    • one year ago
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    Slope of <1, 2> = 2/1 = 1 Slope of <-4, 8> = -8/4 = -2 Since 1 and -2 are not negative reciprocals, the vectors are not perpendicular. Since 1 and -2 are not equal, the vectors are not parallel.

  8. anonymous
    • one year ago
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    Got it

  9. anonymous
    • one year ago
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    And my last one is okay as well?

  10. anonymous
    • one year ago
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    @mathstudent55

  11. mathstudent55
    • one year ago
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    The dot product of two vectors is a scalar, just a number.

  12. mathstudent55
    • one year ago
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    v ⋅ w = <9, -7, -1>⋅ <-5, -2, 6> = 9(-5) + (-7)(-2) + (-1)(6) = -45 + 14 - 6 = -37

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