Question is in the picture.(answer needs to be final answer in fraction form)

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)