Suppose that you have just read a careful statistical study of the effect of advertising on the demand for cigarettes. using data from new york during the 1970s, the study concluded that advertising on buses and subways was more effective than print advertising. use the concept of external validity to determine if these results are likely to apply to boston in the 1970s; los angeles in the 1970s; new york in 2010.

start by isolating the variable on one side by adding 43w^2 to both sides.   the equation will read:

25w^2+5=0

*subtract 5 from both sides*

25w^2=-5

*divide both sides by 25*

w^2=-1/5

*take the square root of both sides*

w=√(-1/5)

the square root of -1 is i.   the square root of 5 remains √5

the answer is i/√5.

hope this

there was no passage listed but using the process of elimination i'd say it was d. the high economy would do the opposite. i don't see how low prices would affect it. high unemployment is possible but i feel d is the better answer.

was my answer wrong?