Which of the graphs shown below are trees? 
Definitions:
Economic Losses
Occur when a company's total costs exceed its total revenues, resulting in a negative profit.
Industry Output
The total production of goods and services by all firms in a specific industry over a given period.
Market Supply Curve
A graph showing the total quantity of a good that producers are willing to sell at different prices.
Easy Entry
A characteristic of market structures where new competitors can easily enter the market without significant barriers or cost.
Q17: Your dorm building consists of four floors,
Q30: After finishing college, you start working as
Q31: What is probably the most important factor
Q32: You plan on constructing a Sierpinski gasket
Q38: Construct a finite-state automaton that recognizes the
Q40: Slopes that drop or rise sharply in
Q42: Construct a finite-state machine with output that
Q44: Which locations) have loose, angular rocks? <img
Q46: Suppose a phrase-structure grammar has productions S
Q74: Which of the following are ways that