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March 27, 2017

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A brick staircase has a total of 16 steps The bottom step requires 112 bricks. Each successive step requires 4 fewer bricks than the prior one. How many bricks are required to build the staircase?

  • Algebra - ,

    you are finding the sum of 16 terms of an arithmetic sequence where
    a = 112
    d = -4
    n = 16

    S16 = (16/2)[2(16) + 15(-4) ]
    = .....

  • Algebra - ,

    -224

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