X + y = 12 x - y = 10
What is the value of the x-determinant for the system shown?
-12
-22
-2

no i do not : ( what is it?

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

any of them that add up to 180 degrees.