7. stressful travel: in a survey of 3224 u. s. adults, 1515 said flying is the most stressful form of travel.
construct a 95% confidence interval for the proportion of all adults who say flying is the most stressful
form of travel.

i believe it's a.

i'm not sure on this one, most likely correct.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

the answer to your question is b.

i think da answer is

d.square root of 3