Please help the questions are in the picture above

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=4 and bc=3, find ah, ch and bh.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?