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Without the sketch provided, it is difficult to determine what Alejandro's graph says will happen to the person. However, if his graph shows a downward trend or a negative slope, it could indicate that the person's height is decreasing over time. If this is the case, I would suggest to Alejandro that there might be a mistake in his graph as height typically does not decrease over time for most individuals.
To help him fix it, I would advise him to double-check his data and calculations, ensuring that he is accurately representing the height measurements at each time point. Additionally, I would emphasize that it is important to consider realistic growth patterns and understand that height generally increases or remains relatively stable over time, especially during growth stages.