Solve the problem.
-The number of births in County A has been increasing in recent years. Use the information given in the bar graph for the years 1960 and 1990, letting x = 0 represent the year 1960 and letting y represent the number of births. Use the graph to estimate the number of births in 1970. 
Definitions:
Exchange
The act of trading goods, services, or currencies among parties.
Opportunity Cost
Forfeiting the immediately lesser choice has a cost attached when decisions are being made.
TV Commercials
Short visual advertisements broadcast on television to promote products, services, or ideas to a wide audience.
Opportunity Cost
The price paid for not selecting the next most favorable choice during decision-making.
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