Solve the problem.The difference between a country's exports and imports is called the country's trade balance. If one country had a trade balance of -$87 billion one year, $116 billion the following year, and -$49 billion the third year, what was the total trade balance for these three years?

A. 20 billion dollars
B. -252 billion dollars
C. 252 billion dollars
D. -20 billion dollars


Answer: D

Mathematics

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A. a18b12 B. a2b3 C. a12b18 D. a3b2

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Mathematics