Question 4619
you basically do Pythagoras' theorem on the numbers -5 and 12 --> you should always recognise a 5,12,13 (and the classic 3,4,5) right-angled triangle.


so, absolute value is {{{sqrt((12)^2 + (-5)^2)}}}
{{{sqrt(144 + 25)}}}
{{{sqrt(169)}}}
--> 13


jon