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Which is a cost that comes with using coal as an energy source? A. Coal will stay plentiful in the United States. B. When burned, coal produces pollutants that are released into the air. C. Mining coal
asked
Jan 20, 2016
Biology
high-school
2
answers
5
votes
145k
views
A bookstore can purchase several calculators for a total cost of $120. If each calculators cost $1 less, the bookstore could purchase 10 additional calculators at the same total cost. How many calculators
asked
Aug 9, 2015
Mathematics
high-school
1
answer
0
votes
56.0k
views
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