I believe it is el because pedro and hermano are masculine.
Answer:
1. De donde eres
which means where are you from? All the others mean how are you?, Whats new? and How is it going?
2. De nada
which means you're welcome, All the others mean goodbye, see you later, and see you tomorrow. Which are all ways of saying goodbye.
3. La siento
which means I can feel it, All the others mean you're welcome, delighted, and and the pleasure is mine.
the answer to 10 divided by 5/6 is 12
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