Daria sells televisions. She earns a fixed amount for each television and an additional $20 if the buyer gets an extended warranty. If Daria sells 18 televisions with extended​ warranties, she earns $1,350 . How much is the fixed amount Daria earns for each​ television?

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.  

median- 36f

mode - none

mean- 33.7 ~ 34f