describe a set of data that has neither a positive nor a negative association , but does have a valid trend line

y = x + 95

y = 42 + 95

y=137 mm hg

1 is c

2 is a

3 is a

step-by-step explanation:

the answer is c)8

step-by-step explanaction:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4