500
How did Frederick act to benefit himself, even though it angered Master Thomas?
What is he let Master Thomas's horse run away so that he'd have to chase after it and end up at his father-in-law's farm, where he could find food.
"My reason for this kind of carelessness, or carefulness,
was, that I could always get something to eat when I went there. Master William Hamilton, my master’s father-in-law, always gave his slaves enough to eat. I never left there hungry, no matter how great the need of my speedy return."