2+2+3+8+3+8+6+4+0+8+4

∠cbe and ∠deb are same-side interior angles.

i took the test

- (2, -7)

- lines r and s and lines t and u must be parallel

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.