You need to ask specific questions and people will answer
Since the 1990s , trade has grown very fast driven by a mix of technological change and policy reforms . With the exception of 2009 trade growth has still remained positive and much bigger than economic growth . This underlined clearly that trade is effective engine for growth.
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By mid point equation, x = 2, y = 0.5, the answer is 0.5
1 and 2 because its nature