Which of the following sets would have a graph that is a closed circle on-4 and an arrow to the left? OxIXER, x>-4)
OXIXER, X<-4}
O{XIXER X2-4)
(XIXER XS-4)

x is variable or an unknown value to find

example:

2x = 5 which means x = 3

36 is the final answer! : )

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