7. According to the U.S. Energy Information Administration, in 1989 the U.S. population consumed a total. of 81,342 trillion British thermal units (Btu) of energy, including 5,677 trillion Btu of nuclear electric power and 2,884 trillion Btu of hydroelectric power. In scientific notation, how many more Btu of nuclear electric power were consumed than Btu of hydroelectric power?

(Note: 1 trillion = 1,000,000,000,000)