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  1. G

    My Nokia 5610 cannot sent messages but I can receive them. It asked me for a center number?

    A few days ago, I was able to send and receive text messages but yesterday My phone asked me for my center number. I wasn't sure what that meant so I simply wrote my own number. Now when I try to send a text message, all it says is that the message has failed. Anyone know how to unlock this...
  2. G

    Under what conditions will the plot of the direction field for dy/dx = f(x, y) show...?

    A vertically repeating pattern? And please provide explanation. Best explanation gets 10 points.
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