math (combinations)
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The Hamburger Depot offers burgers fixed 5 different ways. They also offer French fries, tater tots, onion rings, and cheese sticks as side orders. How many different combinations of one hamburger and one side could be offered?: *

Just think of what is happening. Each burger can be paired with one of 4 different side orders. How many choices of burger are there?
I hope this helps you to solve the problem yourself. Thanks for asking. 
How many different teams of eleven players can be selected from fifteen members?