170 - is General Nursery care whereas 0171 reflects routine care of normal full term or preterm neonate (Nursery Level I). This is per NUBC and UB92/04 descriptions of Revenue codes.
A nursery is a place, usually a business, that grows and sells plants. Usually, nurseries grow some of their own plants and buy other plants from other nurseries to sell at the correct times to plant...
About four years. You should be able to do algebra as a freshman in high school, and you should be able to do calculus as a freshman in college. This is often compressed to three or two years...