Personal Finance on endgenuity. Need help with this assignment.

Which number completes the inequality? 2/3 < _ < 7/9

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite

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