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Synopsis Absolute value of a number.
Function &T <: num abs(&T <: num N)
Usage import util::Math;
Description Absolute value of the number n. The result type is equal to the type of the argument n.
Examples 
rascal>import util::Math;
ok
rascal>abs(13)
int: 13
rascal>abs(-13)
int: 13
rascal>abs(3.14)
real: 3.14
rascal>abs(-3.14)
real: 3.14

Questions
Question [1].
The type of abs(-12) is

Question [2].
The type of abs(-7.33382863897691800) is

Question [3]. 
abs(-9) ==

Question [4]. 
abs(-6.2233224172899127) ==



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