According to piaget, what do adolescents employ during the formal operational stage of development that them reason differently than children in the concrete development stage

In 1990, the average income for an american worker was $1,518 per month. in 2000, the average income for an american worker was $2,632 per month. during this time period, a basket of necessities (food, housing, etc.) increased from $657 per month in 1990 to $1,402 per month in 2000. the real value of income ▼ increased decreased over that 10-year period.

What was one step that charlemagne took to unite his kingdom? a. he chose a single strong heir to inherit his throne. b. he drove muslim forces out of europe. c. he created and supported schools. d. he declared himself head of the catholic church.

Sarah has been collecting intensive interviews with women who organize in grassroots movements for wages for housework. now she is looking over the interviews and trying to find common themes within them. what part of the research process is she in?