Fernando cleans pools for the summer for $25 an hour plus a supply fee of $15. Which equation models the cost for having Fernando clean a pool for x hours and how much will a 3-hour cleaning cost?

A
y=(25+15)+x;43

B
y=15x+25;70

C
y=25x+15;90

D
y=(25+15)x;120

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.