Which values are written in proper 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. In C, E, and F, the coefficient has absolute value 3.50, so each is in proper scientific notation; the coefficient may be negative, as in C. The other choices are not written as a number times a power of 10, or their coefficient would not be in the required range.

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