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There's a list of Base Attack bonusses for all classes on page 157 of the manual. There are three catagories, roughly Fighting classes, Wizard classes and inbetween.
You look up the bonus for your first class (4 barbarian = +4) and your second class (5 figher = +5) and your third class (non-existant), and add those up (4 + 5 = 9). Looking down the table, you'll see that gives you a +9/+4 attack bonus, meaning 1 attack per round at a basic +9 and a second at a basic +4.
A 2 sorcerer, 6 rogue, 3 ranger would have 1 + 4 + 3 = 8 for a +8/+3 base attack.
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