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wintersuntime

  • one year ago

Can someone be nice enough to help me please ?

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  1. anonymous
    • one year ago
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    Whats the question?

  2. wintersuntime
    • one year ago
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    I need help with function A and B

  3. wintersuntime
    • one year ago
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    @peachpi

  4. anonymous
    • one year ago
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    look at the y's to figure out the pattern. What are they doing to get to the next number? Think in terms of addition and multiplication

  5. wintersuntime
    • one year ago
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    multiplying by 2

  6. anonymous
    • one year ago
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    right, so that's the answer to #1

  7. wintersuntime
    • one year ago
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    For number 2 what it be f(x) = f(n-1) x 2

  8. anonymous
    • one year ago
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    For the recursive formula, the first thing is to write the first term. It looks like they're using function notations, so start with f(1). y is 5 when x is 1, so the first part is \[f(1)=5\] Then since it's multiplying by 2, \[f(n)=2f(n-1)\]

  9. anonymous
    • one year ago
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    make sense?

  10. wintersuntime
    • one year ago
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    So it would only be f(n)= 2f(n-1)

  11. anonymous
    • one year ago
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    no, you need to keep f(1) = 5 as well. The recursive formula only gives you a term if you know the previous term

  12. wintersuntime
    • one year ago
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    so f(1)=5 2f(n-1)

  13. anonymous
    • one year ago
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    yes

  14. anonymous
    • one year ago
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    actually, no

  15. wintersuntime
    • one year ago
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    between 5 and 2 i don't put nothing ?

  16. anonymous
    • one year ago
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    Write it like this \[f(1)=5, f(n)=2f(n-1)\]

  17. wintersuntime
    • one year ago
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    oh it was like that

  18. anonymous
    • one year ago
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    It's saying that the first term is 5. Then to find the second term, multiply the first one by 2. Then to find the third term, multiply the second by 2. and so on. So with a recursive formula, if you want to know the 67th term, you have to know the 66th. But to know the 66th, you have to know the 65th and so on. It's only useful to point out the pattern. Not really useful for anything else

  19. anonymous
    • one year ago
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    The explicit one is the useful one. \[f(n)=ar^{n-1}\] a = first term r = number you multiply by (called the common ratio) Plug in your numbers to that formula to get the explicit formula

  20. wintersuntime
    • one year ago
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    so i plug in 65?

  21. anonymous
    • one year ago
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    no, your first term is 5, and you're multiplying by 2. So plug in 5 for a and 2 for r to get the formula

  22. anonymous
    • one year ago
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    \[f(n)=5(2)^{n-1}\]

  23. wintersuntime
    • one year ago
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    oh

  24. anonymous
    • one year ago
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    the function for A is geometric because it's multiplying by the same number to get to the next term.

  25. wintersuntime
    • one year ago
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    Isn't it geometric

  26. anonymous
    • one year ago
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    yeah geometric

  27. anonymous
    • one year ago
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    I gtg. sorry I can't stay to help on the next one

  28. wintersuntime
    • one year ago
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    its okay

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