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anonymous

  • one year ago

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  1. anonymous
    • one year ago
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    Determine if the graph is symmetric about the x-axis, the y-axis, or the origin. (5 points) r = 5 + 4 cos θ x-axis only y-axis only No symmetry Origin only

  2. anonymous
    • one year ago
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    Find an explicit rule for the nth term of the sequence. (5 points) 7, -7, 7, -7, ... an = 7 (-1)n - 1 an = 7 (-1)n an = 7 1n - 1 an = 7 1n + 1

  3. anonymous
    • one year ago
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    Given that the graph of cosine function is like the picture below: |dw:1435057103375:dw|. The 4 that multiplies the cos, means that every value of y is going to increase by a factor of 4. At the end, the shape remains and it is just that the graph is more stretched vertically. The 5 that adds the function, means that every coordinate has to increase by 5 at the y-coordinate. In this scenario, the graph will basically move upwards in the y-axis, but still maintaining the same shape. Ultimately, the graph still has a symmetry in the y-axis. Therefore, answer is A.

  4. welshfella
    • one year ago
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    for the second question try plugging in values for n = 1,2 and 3 into the options to which one fits

  5. welshfella
    • one year ago
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    for example when n = 1 a1 = 7 * (-1)^1-1 = 7* (-1)^0 = 7*1 = 7

  6. welshfella
    • one year ago
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    so n =1 fits the first option now try n = 2

  7. welshfella
    • one year ago
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    when n = 2 a2 = 7 * (-1)^(2-1) = ? can you work that out?

  8. anonymous
    • one year ago
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    an = 7 1n - 1???

  9. welshfella
    • one year ago
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    (-1)^(2-1) = (-1)^1 = ?

  10. anonymous
    • one year ago
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    an = 7 1n - 1???

  11. anonymous
    • one year ago
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    @welshfella

  12. anonymous
    • one year ago
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    @welshfella

  13. welshfella
    • one year ago
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    you replace the n by 2 an = 7 (-1)^(n-1) so a2 = 7 (-1)^(2-1)

  14. welshfella
    • one year ago
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    a2 = 7 * (-1)^1 = 7* (-1) = -7 this is the same value as in the series so it looks like we have the correct option to confirm this work out the third term a3 which should come to 7 a3 = 7 * (-1)^(3-1) can you do that?

  15. welshfella
    • one year ago
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    first work out the 3 -1

  16. welshfella
    • one year ago
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    a3 = 7 * (-1)^2 can you continue?

  17. welshfella
    • one year ago
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    you need to work out (-1)^2 next

  18. welshfella
    • one year ago
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    (-1)^2 = -1 * -1 = ?

  19. anonymous
    • one year ago
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    1?

  20. anonymous
    • one year ago
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    @welshfella

  21. welshfella
    • one year ago
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    right so finally a3 = 7*1 = ?

  22. anonymous
    • one year ago
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    7!

  23. anonymous
    • one year ago
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    @welshfella

  24. welshfella
    • one year ago
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    yes so the first 3 terms are 7,-7,7 so we've found the correct option ( a4 = -7 ) correct option is A

  25. anonymous
    • one year ago
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    Thank you so much... I love you

  26. anonymous
    • one year ago
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    @welshfella

  27. welshfella
    • one year ago
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    ok ok! yw

  28. anonymous
    • one year ago
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    lol chappy you forgot to close the question /_^

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