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iwanttogotostanford

  • one year ago

ACT PREP Q: if 5 times a number n is subtracted from 15, the result is negative. Which of the following gives the possible value(s) for n?

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  1. iwanttogotostanford
    • one year ago
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    @Vocaloid

  2. iwanttogotostanford
    • one year ago
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    0 only 3 only 10 only all n greater than 3 all n less than 3 ANSWER CHOICES

  3. Vocaloid
    • one year ago
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    "negative" means less than 0, so 15 - 5n < 0 know where to go from here?

  4. iwanttogotostanford
    • one year ago
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    would you add 15 to the other side?

  5. Vocaloid
    • one year ago
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    subtract

  6. iwanttogotostanford
    • one year ago
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    so we would then have -5n less than -15?

  7. Vocaloid
    • one year ago
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    yes, do you know what to do next?

  8. iwanttogotostanford
    • one year ago
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    divide!

  9. iwanttogotostanford
    • one year ago
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    so would n=3?

  10. Vocaloid
    • one year ago
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    almost but not quite so we have -5n < -15 divide both sides by -5 gives us n > 3 (remember, when we divide or multiply by a negative number, the inequality sign flips direction)

  11. anonymous
    • one year ago
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    15<3n or3n>15 ?

  12. iwanttogotostanford
    • one year ago
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    so n greater than 5?

  13. Vocaloid
    • one year ago
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    3

  14. Vocaloid
    • one year ago
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    n > 3

  15. iwanttogotostanford
    • one year ago
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    ok so the answer would then be all n greater than 3?

  16. Vocaloid
    • one year ago
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    yes

  17. iwanttogotostanford
    • one year ago
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    okay! one more question ??? @Vocaloid

  18. Vocaloid
    • one year ago
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    sure, post away ~

  19. iwanttogotostanford
    • one year ago
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    ok, should i create a new Q?

  20. Vocaloid
    • one year ago
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    yes

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