Why isn't the set of ordered pairs { (2, 4), (4, 3), (1, 3), (2, 1) } a function?

There is no formula given for the function.
Each x does not have a unique y.
Each y does not have a unique x.
The numbers are NOT in order.
Function, Ordered Pairs





After plotting the data, what type of correlation is there between the areas of the 5 largest lakes in North America and their maximum depths?
Lake
Area (sq. mi.)
Depth (ft)
Superior
31,700
1,330
Huron
23,000
750
Michigan
22,300
923
Great Bear
12,096
1,463
Great Slave
11,031
2,015
Data source: US Geological Survey


Strong, positive correlation
Strong, negative correlation
Weak, positive correlation
Weak, negative correlation



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