Jefferson stops by a fast-food restaurant for a $3.50 cheeseburger every day. if he only ate at home and eliminated this cost, how much could he save after 10 weeks?

There are 7 days in a week, so Jefferson stops at the fast-food restaurant 7 days a week x $3.50/day = $<<7*3.5=24.50>>24.50 per week.

Over 10 weeks, he could save $24.50/week x 10 weeks = $<<24.5*10=245>>245. Answer: \boxed{245}.