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I live in the Netherlands, and I promised a girl to give her English tutoring. But I just learned it from watching a lot of English tv series so I don't really understand the rules. I'm the best of my class, but I don't know the rules, I just know how to do it. How do I give English tutoring?

I have an iPhone 3GS, I used some plastic foil to cover up the ear piece(for calling) and put an extention piece for the ear buds on there, using some hot glue, after letting it cool for a little I sealed the bottom three whole in the iPhone, but they can come back out. My iPhone is now water...

Repetitive operations can usually be simplified into one operation. When one always adds the same number, for example 3+3+3+3+... this can be written as 3n where n is the number of 3's. With multiplication, we can do something similar: 3x3x3x3x3x... This can be expressed as 3^n. But my question...