What is the graph for y=3(x-1)^2

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72

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.