Let F be the free group on {x, y}. Prove that the elements u = x 2 , v = y 2 , and z = xy generate a subgroup isomorphic to the free group on {u, v, z}.

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.