Answer:
Judy marries a business man from Detroit and Dexter makes tons of dough by investing a chain of high-end laundries.
Explanation:
Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
Answer:
the authors purpose is to convey the idea of learning
