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26 July, 11:55

To encourage recycling, many states require a 7¢ deposit on drink containers. The total deposit (d) you pay depends on the number of containers (n) you buy. The function d = 0.07n could be used to describe this situation. If your deposit is $1.40, how many containers did you buy?

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  1. 26 July, 14:30
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    D = total deposit

    n = number of containers

    In this case, we are told d = $1.40.

    We need to find n.

    Write the given equation.

    d = 0.07n

    Substitute the information we know, d = 1.40.

    1.40 = 0.07n

    Solve for n.

    Divide both sides by 0.07.

    20 = n

    n = 20

    Answer: 20 containers.
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