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Fuel cells have been developed that can generate a large amount of energy. For example, a hydrogen fuel cell works by combining hydrogen and oxygen gas to produce water and electrical energy. If a fuel
asked
Dec 16, 2017
Physics
high-school
1
answer
2
votes
230k
views
If the sum of two positive numbers is 40, and their difference is 14, what is the product of the two numbers
asked
Jun 17, 2017
Mathematics
high-school
2
answers
3
votes
65.3k
views
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