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anonymous

  • one year ago

Which of the following is a rational number? square root 97square root 98, square root 99, square root 100 square root 97 square root 98 square root 99 square root 100

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  1. UsukiDoll
    • one year ago
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    a rational number can be expressed as a fraction an irritation number can't be expressed as a fraction

  2. UsukiDoll
    • one year ago
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    *irrational

  3. UsukiDoll
    • one year ago
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    examples of rational numbers \[\LARGE \frac{1}{2}, \frac{3}{1}\] Examples of irrational numbers \[\LARGE \pi, e, \sqrt{3}\]

  4. UsukiDoll
    • one year ago
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    let's start with the last one. what is the square root of 100?

  5. anonymous
    • one year ago
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    10 @UsukiDoll

  6. UsukiDoll
    • one year ago
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    yay so that's a rational number. I can express that as a fraction which is \[\large \frac{10}{1} \]

  7. anonymous
    • one year ago
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    right @UsukiDoll

  8. UsukiDoll
    • one year ago
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    I don't think there are any more choices for rational numbers... 97 is a prime number and that's in a square root . that's irrational

  9. UsukiDoll
    • one year ago
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    and even if we did simplify the square root of 98 and 99, we will still have a square root left order...

  10. anonymous
    • one year ago
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    so 97s the awnser @UsukiDoll

  11. UsukiDoll
    • one year ago
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    no for 2 reasons 97 is a prime number 97 is inside the square root and can't be expressed as a fraction .

  12. UsukiDoll
    • one year ago
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    but not all square roots are irrational ... so we need to be careful on this. if we are left with a square root that can be simplified further .. it becomes rational

  13. UsukiDoll
    • one year ago
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    for example \[\LARGE \sqrt{2}\] is irrational but \[\LARGE \sqrt{4}=2\] is rational

  14. UsukiDoll
    • one year ago
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    there could be some more rational numbers lurking

  15. UsukiDoll
    • one year ago
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    or not...

  16. UsukiDoll
    • one year ago
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    |dw:1438236905176:dw| take the square root of 49 and square root of 9

  17. UsukiDoll
    • one year ago
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    even if I do take those square roots, I still have something left over and they are irrational.

  18. UsukiDoll
    • one year ago
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    |dw:1438237057661:dw| I can't express these as fractions ... so again they are in the irrational group

  19. UsukiDoll
    • one year ago
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    but for the last one which is square root of 100 I can express it as a fraction, so that's the rational number we are looking for |dw:1438237176763:dw|

  20. sepeario
    • one year ago
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    * a rational number can be expressed as a fraction of two whole numbers.

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