Plz i'll give brainlest!

a teacher would like to estimate the percentage of her students who play chess. which method should the teacher use to select the sample?

The teacher use the percent of she will multiply. Hope this helps :)

Selecting the sample means choosing the group you will study. In this case, the teacher is studying the class. He or she will measure the entire class and then the number of students who play chess.

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