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Final answer:To place the number 23,000 in scientific notation, it should be written as 2.3 × 10^4.Explanation:To place the number 23,000 in scientific notation, we need to move the decimal point to the left until it is between 1 and 10. Since we need to move the decimal point 4 places to the left to achieve this, the number in scientific notation is 2.3 × 104, which corresponds to option d) 23 × 104....