Which graph/graphs are proportional? Please hurry!

If eh = hg and hg=16, find the diameter of k

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Which expression is equivalent to -5(3x - 6/7)