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Math Help - Arithmetic series question

  1. #1
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    Arithmetic series question

    A common interest in constant. It's $25 per year. Initial deposit is $500. After 10 years the amount of money in the account was $750. Using the arithmetic sequence which is tn= a+(n-1)d. Can you find how much money is in the account after 20 years?
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  2. #2
    Member SengNee's Avatar
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    Quote Originally Posted by muhammadque View Post
    A common interest in constant. It's $25 per year. Initial deposit is $500. After 10 years the amount of money in the account was $750. Using the arithmetic sequence which is tn= a+(n-1)d. Can you find how much money is in the account after 20 years?
    It's $25 per year.
    d=+25

    Initial deposit is $500.
    a is greater than or equal to 500.

    After 10 years the amount of money in the account was $750.
    T_n=a+(n-1)d
    T_{10}=a+(10-1)d
    a=?

    After 20 years.
    T_{20}=?
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