SOLUTION: It is expected that 563 quadrillion thermal units of Btu (British thermal units) of energy will be consumed worldwide in 2015. In 2003, worldwide consumption was 421 quadrillion Bt

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Question 1010379: It is expected that 563 quadrillion thermal units of Btu (British thermal units) of energy will be consumed worldwide in 2015. In 2003, worldwide consumption was 421 quadrillion Btu. What is the expected rate of change in consumption from 2003 to 2015.
Found 2 solutions by macston, fractalier:
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
563 quadrillion-421 quadrillion/12 years=142 quadrillion/12years=11.83 quadrillion/yr

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Let's subtract the two amounts and then divide by the twelve years to find the average increase (rate of change)...
(563 - 421)/12 = 11.83 quadrillion BTU/yr