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6 February, 12:02

You have $40 in a savings account and you deposit an equal amount into your account each week. after 8 weeks the account holds $128. write an equation that represents the amount yy (in dollars) of money in the account after xx weeks.

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  1. 6 February, 14:28
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    40*x^8=128

    x^8=128:40

    x^8=3.2

    X=1.156494986 (8th root of 3.2)

    40*1.156494986^xx=yy
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