How much is 2 euros cost in the U. S dollars? 5 euros? 10 euros?

$2.43

Step-by-step explanation:

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.  

$25 becasue a 10 increase would make it from 80 to 50