To determine which numbers are not written in scientific notation, we need to look for the standard form of scientific notation, which is typically expressed as \(a \times 10^n\), where \(1 \leq |a| < 10\) and \(n\) is an integer.
Now, let's evaluate the options:
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\(6 \times 10^2\) - This is in scientific notation because \(6\) is between \(1\) and \(10\).
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\(6\) - This is not in scientific notation because it does not have the \( \times 10^n \) format.
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\(7.23 \times 10^{-3}\) - This is in scientific notation because \(7.23\) is between \(1\) and \(10\).
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\(0.5 \times 10^{-12}\) - This is not in proper scientific notation because \(0.5\) is less than \(1\). To convert it to proper scientific notation, it should be written as \(5.0 \times 10^{-13}\).
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\(1.8 \times 10^4\) - This is in scientific notation because \(1.8\) is between \(1\) and \(10\).
From these observations, the numbers that are not properly expressed in scientific notation are:
- \(6\)
- \(0.5 \times 10^{-12}\) (because \(0.5\) is not in the range of \(1\) to \(10\))
If you can only select one, then \(6\) is the simplest choice as it lacks a \( \times 10^n \) component entirely.
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