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7 April, 02:18

The sum of an unknown number and fifteen is decreased by eight. The result is two.

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Answers (2)
  1. 7 April, 02:32
    0
    -5

    Step-by-step explanation:

    Let's call this unknown number x.

    Then (x+15) - 8=2. Therefore, x=2+8-15 = - 5.
  2. 7 April, 02:40
    0
    n+15 - 8 = 2

    n=-5

    Step-by-step explanation:

    Let n be the unknown number

    sum of an unknown number and fifteen

    n+15

    is decreased by eight

    n+15 - 8

    The result is two.

    n+15 - 8 = 2

    Combine like terms

    n + 7 = 2

    Subtract 7 from each side

    n+7-7=2-7

    n=-5
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