Need help! Do anyone know?

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

What is the value of x in the equation 3x4y65, when y=4?

The limit in 2008 for fica tax was 102,000. so if an individual makes $314,000 in one year, how much in "continuing" medicare tax will they have to pay? (medicare tax is 1.4% for individuals and 2.9% for the self-employed.) a: 2,968.00 b: 4,396.00 c: 6,148.00 d: 9,106.00