Your missing exchange commodities.
I hope this helps
C
there can be more than one mode. 20 and 30 have the same amount and are most frequent
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Answer:A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x² = −1. Because no real number satisfies this equation, i is called an imaginary number.
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