Answer: b. contribute to an understanding of how the world works.
Explanation: Economics is a branch of social sciences that studies the choices individuals and organizations make in using their limited resources to satisfy their unlimited wants. In essence, it is a study that aims to understand trade and industry as well as how people interact with these. Economists who formulate new theories work towards a better understanding of what motivates people, why they make the decisions they do and how the market reacts to the actions they take.
 
        
             
        
        
        
Answer: . What is a read-only domain controller (RODC)?
A. An RODC is a new domain controller (DC) mode in Windows Server 2008. It lets you store an Active Directory (AD) domain database read-only copy on the DC, but it has much more functionality than just a database read-only copy.
Explanation:
 
        
             
        
        
        
Mnemonic technique is the correct answer. 
Mnemonic is a very effective memory technique that helps people to remember important words, a list of things or larger pieces of information through association. Martha uses this simple technique by rhyming items, but she could also use humor, exaggeration, and symbols to help her learn and enhance memory.  
 
        
             
        
        
        

Alfonso's average speed was 400 meters per minute.
 
        
             
        
        
        
The answer to this question is  40-60% ; 25%
Other estimation is based not based on the raw intellegence possesed but rather based on whether they could use the intelligence for real life purpose. Studies shows that even though young adults already fully developed the capability for formal operational thinking , onle a quarter of them actually got used to doing it.