Roads55 is correct. You would win $35 on DC and lose your $250 on Lewis. Google "Parlay Calculator" and you will get many websites where the math is done for you. Just type in the odds and bet amount. The easiest way to figure it out is that you need to risk $700 to win $100 if you bet on DC. So even if you put $700 on DC and $250 on Lewis you still will lose $150 overall.