Which of the following types of graphs is best for plotting the mean, median, and mode of data? Bar graph
Box-and-whisker
Circle graph
Stem-and-leaf

Stem-and-leaf. You can use a stem-and-leaf plot to find the mean, median and mode of a set of data.

i think it would be 42cm

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