Choose 3 research topics that would be best addressed through an observational study.
A. Does listening to loud music with headphones affect a person's
hearing?
B. Does second-hand smoke affect the health of pets?
C. Does a particular medication make seasonal allergy symptoms less
severe?
D. Does increasing the number of stoplights per mile on a road decrease the number
of car accidents on the road?
E. Does drinking sports drinks before and while playing a game of baseball increase
the number of runs scored?
F. Does a certain toothpaste prevent cavities in children better than another
toothpaste?

step-by-step explanation:

the true ones are a b and d

isocolese triangle

we know that the line connect a and b is the hyptonuse

so first find the hypotonuse length using the distance formula, call the length c

since it is an isocolese triangle, the lengths of the legs are the same

using pythagorean theorem,

in this case, a=b since isocolese triangle so we get

or

we can find c so we can find the distances

we know that if we draw 2 circles, each has center at a and b, and find where they intersect, we can the 2 possible locations for c

if a has center at (xa,ya) and b has center at (xb,yb), then we can solve where

and

intersect to find where they intersect

i'm not going to put an example because i have to go to class. i hope this explanation is enough