Answer:
3 [tex](\frac{5}{6}) ^{4}[/tex]
Step-by-step explanation:
each post is [tex]\frac{5}{6}[/tex] the height of the previous post
there are 4 poles between the tallest 3 ft and the smallest
this involves multiply the heights of previous poles by [tex]\frac{5}{6}[/tex] , 4 times
shortest pole = 3 × [tex](\frac{5}{6}) ^{4}[/tex]
