The optimal use of a resource takes place when which of the following happens A) the benefit is greater than the opportunity cost
B) the supply and demand curves never intersect
C) the opportunity cost is greater than the actual cost
D) there is a decrease in the marginal utility of a decision

barack obama

i love this guy

f 5 , h

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.