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AP® Environmental Science

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Hydropower Math

APES-WEFF8O

"U.S. Energy Information Administration - EIA - Independent Statistics and Analysis." U.S. Hydropower Output Varies Dramatically from Year to Year. US Energy Information Administration, n.d. Web. 10 Apr. 2016. http://www.eia.gov/todayinenergy/detail.cfm?id=2650.

Using the graph above, estimate the change in hydropower from the peak to the most recent date.

A

A decrease of about $4 \times { 10 }^{ 7 }$ megawatt-hours.

B

A decrease of about $1 \times { 10 }^{ 8 }$ megawatt-hours.

C

An increase of about $2 \times { 10 }^{ 8 }$ megawatt-hours.

D

An increase of about $1.3 \times { 10 }^{ 8 }$ megawatt-hours.

E

An increase of $3.5 \times { 10 }^{ 6 }$ megawatt-hours.