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anonymous

  • one year ago

Avery has a total of $12.50 in her piggy bank at home. Each week she takes out $1.25 to ride the city bus. Write an equation representing the balance, C, in the piggy bank, where w is the number of weeks.

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  1. ganeshie8
    • one year ago
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    Since the starting amount is \($12.50\), the amount in her piggy bank in \(\text{week 0}\) is \($12.50\)

  2. ganeshie8
    • one year ago
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    Can you guess the amount in her piggy bank during \(\text{week 1}\) ?

  3. anonymous
    • one year ago
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    11.25

  4. ganeshie8
    • one year ago
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    Yes! because she takes out \(1.25\) : \[\large 12.50-\color{red}{1.25} = 11.25\]

  5. ganeshie8
    • one year ago
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    can you guess the amount in her piggy band during \(\text{week 2}\) ?

  6. anonymous
    • one year ago
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    10

  7. ganeshie8
    • one year ago
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    Correct! you must have worked it by subtracting \(1.25\) again : \[\large 12.50-\color{red}{1.25} -\color{red}{1.25} = 10\]

  8. anonymous
    • one year ago
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    i know how to subtract. i just need help with how i write the equation. I know that it begins like "C=......"

  9. ganeshie8
    • one year ago
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    Notice the pattern ? can you find the amount in her piggy bank during \(\text{week} 8\) ?

  10. ganeshie8
    • one year ago
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    you just need to subtract \(\color{red}{1.25}\) for \(8\) times right

  11. ganeshie8
    • one year ago
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    so the amount in the bank after \(w\) weeks is given by : \[C ~~=~~12.50~-~\color{red}{1.25}w\]

  12. anonymous
    • one year ago
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    Those are my choices C = 1.25w – 12.50 C = 1.25w + 12.50 C = –1.25w + 12.50 C = –1.25w – 12.50

  13. anonymous
    • one year ago
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    Would i just move it around????

  14. anonymous
    • one year ago
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    I thought that it was C=12.50-1.25w but thats not up there.

  15. ganeshie8
    • one year ago
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    Yes \[C ~~=~~12.50~-~\color{red}{1.25}w\] is same as \[C ~~=~-~\color{red}{1.25}w~+~12.50\]

  16. anonymous
    • one year ago
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    ohhhhhhh okay. haha. thats all i really needed to know. Thank you.

  17. ganeshie8
    • one year ago
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    yw!

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