Luis brings flowers to his girlfriend at school because she has been very understanding about his busy sports schedule.
this is an example of which of the following?
positive reinforcement
negative reinforcement
punishment
classical conditioning

the answer would be positive reinforcement considering he is rewarding his girlfriend for being understanding.

a) which ethnic groups live in this community?

i just took test

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.