Dr. tucker and his research team are interested in how aggression changes as we age. the team will recruit 100 3-year-old children and assess their levels of aggression every three years until the participants turn 21. this is an example of cross-sectional research. true or false?

False

Step-by-step explanation:

A cross sectional research examines changes between different population in a specific period of time. In this case the investigation of Dr. Tucker, is a longitudinal research. This research analyses changes in the same population in different periods of time which can provide data of changes of behavior of children over the time.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

56

step-by-step explanation: