The regression trend line for annual energy consumption for 2000-2020 is given by 
= 70 + 0.50t,where t = 1 for 2000.If the annual energy consumption for 2015 was 72.5,then the percentage of trend for 2015 was:
Definitions:
Future Price
The price of a good or service that is agreed upon today for delivery and payment at a future date.
Demand Curve
A graph depicting the relationship between the quantity of a good that consumers are willing to buy and its price.
Shift
A change in the position or direction of something, often used in economics to describe changes in demand or supply curves.
Caffeine
A stimulant found in coffee, tea, and other products, known for its ability to increase alertness and reduce feelings of tiredness.
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