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    Payback Exercise - HELP!!?

    BOOK: Economic Engineering 6th edition Chapter: 5 Case Study – Payback Evaluation of Ultralow-Flush Toilet Program Help me solve this exercise please! you are right, is just that my book is in another language, is not english.. let me try...
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    Help me please - Payback exercise?

    BOOK Economic Engineering 6th edition Chapter 5 Case Study –Payback Evaluation of Ultralow-Flush Toilet Program Help me solve this exercise please!
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    Domain of this function?

    What's the domain of this function? f(t) = -9t / t + 8 t + 8 IS the denominator
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    Awesome Photoshop illustrations?

    I have seen beautiful photoshop illustrations of women, fairies, landscapes, etc Here is an example: It´s simple AMAZING! My question is, people that draw like this at photoshop, can also do the same with paper and pencil? because I dont draw like this but I am wondering if I could do if...
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    Will eating apples while drinking alcohol...?

    ...ruin your buzz? I heard that the best way to get extremely tipsy is to drink on an empty stomach, but will eating apples ruin that?
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