A swimming pool is being drained. The number of gallons of water in the pool changes with time t according to the equation G = -4t + 100. Which equation correctly solves the given equation for t?
A) t = 4G - 100
Eliminate
B) t = -4G + 100
C) t =
100 - G
4
D) t =
G - 100
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.