Which numbers are written in scientific notation? Check all that apply.

Scientific notation has the form a × 10ⁿ, where the absolute value of a is at least 1 and less than 10. The coefficients 2.7, 6.1, and 9.582 meet that rule, so choices B, C, and D are in scientific notation. The coefficients 10.8 and 21.5 are too large, so A and E are not.

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