When you use paper money to pay for food, the money is a
medium of exchange
store of value
unit of account

What are the major trends and specialties in psychology?

Arandom variable x has a mean of 10 and a standard deviation of 3. if each value of x is multiplied by 2, what will the new mean and standard deviation be?

Territorial insects like spiders that fight off intruders would be expected to be a) regularly distributed b) randomly distributed c) clustered together d) b and c e) selectively distributed