I buy fertilizer to cover the area of my yard which is 50 feet by 120 feet. The directions for the fertilizer are in square yards. How many yd2 of fertilizer will I need? (round up to the nearest whole number)

answer: what do you mean

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.