This graph shows a proportional relationship between the amount of money in jacks savings account and the number of weeks jack has been saving.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

42.4

step-by-step explanation:

convert to decimal

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.