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17 January, 08:34

Yohanna is conditioning all summer to be fit for the next soccer season at his high school. He incorporated walking planks into his daily workout regime. Each day, he will complete 4 more walking planks than the day before. If he starts with 5 walking planks on the first day, how many walking planks will he do on the twelfth day?

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  1. 17 January, 11:01
    0
    4 more than previous day

    so

    aritmetic sequence

    first term is a1

    common difference is d

    an=a1+d (n-1)

    first term is 5 planks

    increases by 4 each day

    an=5+4 (n-1) is the equation for how many he will do on the nth day

    12th day

    a12=5+4 (12-1)

    a12=5+4 (11)

    a12=5+44

    a12=49

    49 walking planks
  2. 17 January, 11:51
    0
    49 walking planks because 5+4+4+4+4+4+4+4+4+4+4+4=49
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