Which expression is equivalent to the fraction with numerator 10 i and denominator 2 minus i ?

Multiply the numerator and denominator by the conjugate, 2 + i: (10i)/(2 − i) = 10i(2 + i)/[(2 − i)(2 + i)] = (20i + 10i²)/5. Since i² = −1, this simplifies to 4i − 2, which is choice B.

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