It is expected that 563 quadrillion thermal units of Btu (British thermal units) of energy will be consumed worldwide in 2015.


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? (what is rate of change?)


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