624 – 4 +9 (y^3+ 6)
O A. 9 (y^3 +6)
O B. -4+9 (y^3 +6)
O c. (y ^3+ 6)
D. 6z^4 -4

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.  

answer: i think its red because you have to see what it equals to

hope that