Need help pronto pls 20pts if you help me

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

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?

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?