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7th grade

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Help me solve this problem, I am lost here.
These are integers,

15-12-8=

also 4-(-7)-9=

and -11-(-5)-(-6)=

  • 7th grade -

    15-12=3
    3-8=-5

    4-(-7)=4+7=11
    11-9=2

    -11-(-5)=-11+5=-6
    -6-(-6)=-6+6=0

  • 7th grade -

    create a set of data showing temp. highs for ten days that satisfies these conditions mean-72 median-74 mode-68 range-21

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