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anonymous

  • one year ago

help please! The table below shows the square roots of different numbers: Number (x) 4 4 9 9 Square root (y) 2 -2 3 -3 Part A: Does the table represent y as a function of x? Justify your answer. (5 points) Part B: The total cost f(x), in dollars, for renting a car for a week and driving it x miles is shown below: f(x) = 90 + 0.11x What is the value of f(300), and what does f(300) represent? (5 points)

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  1. Michele_Laino
    • one year ago
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    hint: the point x=4 has two images, namely +2 and -2, similarly for point x=9 what can you conclude?

  2. anonymous
    • one year ago
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    it is not a function?

  3. Michele_Laino
    • one year ago
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    correct!

  4. anonymous
    • one year ago
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    oh so that would be the answer to part a!? thats so much simpler than i thought

  5. anonymous
    • one year ago
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    now i don't understand where f(300) comes into play?

  6. Michele_Laino
    • one year ago
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    yes! since your function, doesn't check the general definition of a function

  7. Michele_Laino
    • one year ago
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    it is simple, we have to replace x with 300, so we have to compute this: \[\Large f\left( {300} \right) = 90 + 0.11 \cdot 300 = ...?\]

  8. anonymous
    • one year ago
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    oh so that would equal 123?

  9. Michele_Laino
    • one year ago
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    correct!

  10. anonymous
    • one year ago
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    but what does it represent?

  11. Michele_Laino
    • one year ago
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    it is represent the image of the point x=300, by means of your function: |dw:1441637275979:dw|

  12. Michele_Laino
    • one year ago
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    oops..it represents...

  13. anonymous
    • one year ago
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    ooh i think i see, alright thank you so much for your help! @Michele_Laino

  14. Michele_Laino
    • one year ago
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    :)

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