Which of the graphs below are connected? 
Definitions:
Foreign Countries
Nations other than one's own, especially when considered as the context for international trade, diplomacy, or cultural exchange.
Purchasing-power Parity
A theory that states that exchange rates between currencies are in equilibrium when their purchasing power is the same in each of the two countries.
Nominal Exchange Rate
The rate at which one country's currency can be exchanged for another country's currency without adjusting for inflation rates.
Real Exchange Rate
The rate at which goods and services of one country can be exchanged for those of another, adjusting for price level differences.
Q1: If the limits for a class were
Q4: What is critical about the critical path
Q22: Consider the path represented by the sequence
Q42: A correlation coefficient r was calculated to
Q49: When the traveling salesman problem (Hamiltonian circuit)
Q65: What is the range of the set
Q69: Below are the ages of students attending
Q72: Given the order-requirement digraph below (with time
Q103: The mean length of time, per week,
Q108: Find the chromatic number of the graph