Final answer:
Charlie has a memory of playing baseball with his friends in Progress Reports 9 or 10, which brings back feelings of joy and friendship. This memory serves as a reminder of happier times and the importance of connections.
Step-by-step explanation:
One memory (flashback) that Charlie has about his past in Progress Reports 9 or 10 is when he remembers playing baseball with his friends. The memory is vivid and emotionally charged, as he recalls the sound of the bat hitting the ball and the feeling of joy and camaraderie. This memory might affect him in the present by reminding him of happier times and the importance of friendship and connection.