I will fail if i dont pass this test plzz helpp!!​

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

The circle below is centered at the point (3, 1) and has a radius of length 2. what is the equation?

By january 2014 the us population had grown to 317.3 million and the us federal debt was a reported $17.3 trillion. calculate the january 2014 federal debt per capita. (round to the hundredths place)