A scientist wants to find the percent of teens that like the taste of "brand X". lemonade over "brand Y" lemonade. She conducts a taste test of 500
teenagers. She gives each teen a bottle of lemonade with the labels showing
the brand of each lemonade. She asks each teenager to taste each brand
after drinking water in between. She finds that 50% of teens like brand X
and 50% like brand Y lemonade. Why are the results of the survey most
likely unreliable?
The investigation was based on taste.
Not enough teens were interviewed.
Adults were not interviewed.
The lemonade labels introduced bias.

Ibelieve that a would be the best answer.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].