Question: what determines the number of house of representatives
[{'answer': 'fixed by law at 435', 'provenance': [{'wikipedia_id': '19468510', 'title': 'United States House of Representatives', 'start_paragraph_id': 2, 'start_character': 445, 'end_paragraph_id': 2, 'end_character': 464, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19468510', 'title': 'United States House of Representatives', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 687, 'bleu_score': 0.788092849358865, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9236179309545676854}, 'section': 'Section::::Abstract.'}]}]