Para una población de 50.000 habitantes establezca la muestra para una investigación de mercados dónde el nivel de confianza tenido en cuenta es del 90% con un margen de error del 10%

1/4 because there is 4 grades.

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

y=sec x is the correct answer

~batmans wife dun dun

1. supplementary angles

2. acd and bcd

step-by-step explanation: