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anonymous

  • one year ago

What is the value of Fraction 1 over 2x3 + 3.4y when x = 3 and y = 4?

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  1. Michele_Laino
    • one year ago
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    hint: \[\Large \frac{1}{{2{x^3} + 3.4y}} \to \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = ...?\]

  2. anonymous
    • one year ago
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    25.6?

  3. anonymous
    • one year ago
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    @Michele_Laino

  4. Michele_Laino
    • one year ago
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    hint: \[\frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = ...?\]

  5. anonymous
    • one year ago
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    @Michele_Laino im really bad at fractions but i think its 31.6?

  6. Michele_Laino
    • one year ago
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    it is: \[\Large \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = 0.0338\] approximated value

  7. Michele_Laino
    • one year ago
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    \[\large \frac{1}{{2 \times \left( {{2^3}} \right) + \left( {3.4 \times 4} \right)}} = \frac{1}{{16 + 13.6}} = \frac{1}{{29.6}} = 0.0338\]

  8. anonymous
    • one year ago
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    these are the choices though 15.85 18.1 27.1 31.6

  9. Michele_Laino
    • one year ago
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    Sorry I have made an error since we have to substitute x=3 before Nevertheless, my expression above is wrong.

  10. anonymous
    • one year ago
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    oh

  11. Michele_Laino
    • one year ago
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    please write your expression using the editor, or make a drawing of your expression

  12. anonymous
    • one year ago
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    |dw:1435768036043:dw|when x=3 and y=4

  13. Michele_Laino
    • one year ago
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    ok! then we have: \[\frac{1}{2}{x^3} + 3.4y \to \frac{1}{2} \times {3^3} + 3.4 \times 4 = \frac{{27}}{2} + 13.6 = ...?\]

  14. anonymous
    • one year ago
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    27.1

  15. Michele_Laino
    • one year ago
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    that's right!

  16. anonymous
    • one year ago
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    yay thank you (: @Michele_Laino

  17. Michele_Laino
    • one year ago
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    :)

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