Astudy found that, in 2005, 12.5% of u. s. workers belonged to unions (the wall street journal, january 21, 2006). suppose a sample of 400 u. s. workers is collected in 2006 to determine whether union efforts to organize have increased union membership. formulate the hypotheses that can be used to determine whether union membership increased in 2006.

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.