book Maths Puzzle Numerical Ability

1.If eight basket ball teams are in tournament, find the number of differentways that first, second, and third place can be decided. ( assume thre are no ties)

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line passes through (1,5)and(3,13) I don't understand the absolute values of y=|x|
for instance... y= |x-2|
I don't understand what the domain and range are based on and how to graph it!
Please help!