This graph shows the US unemployment rate from August 2010 to November 2011. This graph could help an economist predict

how the government will address unemployment.
which industries are most in need of workers.
how many people will be out of work in the next year.
why producers might hire fewer workers in the future.

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?