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rafeds08

express in roster form: B={xlxE N and 6<x<10}

  • one year ago
  • one year ago

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  1. myininaya
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    Just list all the natural numbers in the interval (6,10)

    • one year ago
  2. rafeds08
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    B={7,8,9}

    • one year ago
  3. myininaya
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    Yep, that is right.

    • one year ago
  4. rafeds08
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    thanks

    • one year ago
  5. myininaya
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    np

    • one year ago
  6. rafeds08
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    what is np?

    • one year ago
  7. rafeds08
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    myininaya', what if the set Q of all prime numbers less than 10? can we consider the negative numbers?

    • one year ago
  8. myininaya
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    I think it depends on the definition of prime numbers your teacher chose. I choose the definition that they are natural numbers greater than 1 and are only divisible by 1 and itself. For example: 13 since 13 and 1 are it's only factors

    • one year ago
  9. UnkleRhaukus
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    \[\{n\in \mathcal N |(1<n<10)∧(\forall x,y\in \mathcal N)[(xy=n)⇒(x=1∨y=1)]\}\]

    • one year ago
  10. myininaya
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    So do you think you can now list the prime numbers between 1 and 10 (not including 10 since it doesn't say equal to)?

    • one year ago
  11. rafeds08
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    yap

    • one year ago
  12. rafeds08
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    A math teacher is preparing an exam each of his Algebra class. Math-alino and Math-matalino, covering topics A (circles) and B (inequalities). He wants to design the exams so that both classes will have the same number of questions on A and also on B. Each question on A is worth 15 points in section Math-alino and 20 points in section Math-matalino while each question on B is worth 10 points in section Math-alino and 5 points in section Math-matalino. If the total number of points in both exams is 100, how many questions should he ask on each topic?

    • one year ago
  13. rafeds08
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    help me please UnkleRhaukus thanks in advance

    • one year ago
  14. UnkleRhaukus
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    too confusing

    • one year ago
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