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thomas wants to build a seven layer brick wall. the bottom layer has 20 bricks and each layer of the wall that goes up has two less bricks than the layer below it. if each brick costs .50 cents to cement how money will Thomas spend on the wall ?

  • math -

    .50(20 + 18 + 16 + 14 + 12 + 10 + 8) = ?

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