Wagering on baseball is done by laying or taking money odds.

The minus (-) indicates the favorite
The plus (+) indicates the underdog

On money odds whenever there is a minus (-) you lay that amount to win a dollar, where there is a plus (+) you get that amount for every dollar wagered.

Example:
       Dodgers: +130
       Phillies: -140

You select the Phillies and lay $140 to win $100 or $14 to win $10.

You select the Dodgers and wager $100 to win $130 or $10 to win $13.