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blackstreet23

  • one year ago

5. Let X = {a, b, c) and Y = {d, e, f, g}. Does the following arrow diagram determine a function from X to Y? Explain. (6 Pts) b. What are the domain, and co-domain

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  1. blackstreet23
    • one year ago
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  2. blackstreet23
    • one year ago
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    @Shalante @ganeshie8 @Hero

  3. blackstreet23
    • one year ago
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    @IrishBoy123

  4. DanJS
    • one year ago
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    Look at what a function does, |dw:1443380326622:dw|

  5. blackstreet23
    • one year ago
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    @pooja195

  6. blackstreet23
    • one year ago
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    @aaronq

  7. blackstreet23
    • one year ago
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    I am confused because it meets the two requirements

  8. blackstreet23
    • one year ago
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    1. All x values have a y value

  9. blackstreet23
    • one year ago
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    2. No same x value has two ys

  10. blackstreet23
    • one year ago
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    but do they need to have the same number of elements in X and Y?

  11. blackstreet23
    • one year ago
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    @SithsAndGiggles

  12. blackstreet23
    • one year ago
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    ?

  13. blackstreet23
    • one year ago
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    two x values can have the same why but not vice versa i think

  14. welshfella
    • one year ago
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    yes another way to say it is a function can be many-to-one but not one-to-many

  15. blackstreet23
    • one year ago
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    yes @welshfella but is that one a function?

  16. blackstreet23
    • one year ago
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    Do the elements on X and Y need to be the same number?

  17. welshfella
    • one year ago
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    what is different with this relation is that you have values of y not linked with a value of x. To be honest i don't know for sure.

  18. DanJS
    • one year ago
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    the co-domain, is all of the output values, the set contains all of the 'graphed' points that are mapped by the rule X-->Y, Plus possibly more.

  19. DanJS
    • one year ago
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    Like say for example, if you have the function f(x) = x^2 The Domain is all real numbers, the range of that is just numbers greater than zero...

  20. welshfella
    • one year ago
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    http://www.mathsisfun.com/sets/domain-range-codomain.html

  21. DanJS
    • one year ago
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    the co-domain though is all real numbers,

  22. DanJS
    • one year ago
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    x ---->x^2, both can be any real number, but the actual image of the graph does not have negative values, so the co domain includes the negative values, the range is just positive values

  23. blackstreet23
    • one year ago
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    so the whole set Y is the codomain

  24. blackstreet23
    • one year ago
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    it does not matter that some elements are not used?

  25. blackstreet23
    • one year ago
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    @welshfella

  26. DanJS
    • one year ago
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    right, the co-domain possibly includes values that aren't graphed by the function

  27. zepdrix
    • one year ago
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    I found this kind of helpful :) http://www.mathsisfun.com/sets/domain-range-codomain.html If you scroll half-way down, the three green check marks.

  28. DanJS
    • one year ago
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    f(x) = x^2 Domain - All Reals Range - y >=0 co-domain - all reals

  29. DanJS
    • one year ago
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    X ----> X^2 you can choose any number for X, domain You can choose any number for X^2, co-domain the results area always positive, Range or the actual graph

  30. blackstreet23
    • one year ago
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    Yeah thanks ! I get it now

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