Which of the following numbers is not written in scientific notation?
A. 7.23 × 10^-3
B. 1.8 × 10⁴
C. 0.5 × 10^-12
D. 6 × 10²
The number not written in scientific notation is D. 6 × 10².
To determine which number is not written in scientific notation, we need to identify the number that does not have a coefficient between 1 and 10, multiplied by a power of 10.
Looking at the options:
A. 7.23 × 10^-3 is written in scientific notation.
B. 1.8 × 10⁴ is written in scientific notation.
C. 0.5 × 10^-12 is written in scientific notation.
D. 6 × 10² is not written in scientific notation because the coefficient is not between 1 and 10.
Therefore, the number that is not written in scientific notation is D. 6 × 10².
To determine which of the numbers is not written in scientific notation, you need to look for the number that does not have the correct format of a decimal number multiplied by a power of 10. Scientific notation is written in the form of \(a \times 10^b\), where \(a\) is a decimal number greater than or equal to 1 and less than 10, and \(b\) is an integer exponent.
Now let's evaluate the options:
A. 7.23 × 10^-3 - This is written in scientific notation because the decimal number 7.23 is between 1 and 10.
B. 1.8 × 10⁴ - This is also written in scientific notation because the decimal number 1.8 is between 1 and 10.
C. 0.5 × 10^-12 - This is written in scientific notation since the decimal number 0.5 is between 1 and 10.
D. 6 × 10² - This is NOT written in scientific notation because the decimal number 6 is not between 1 and 10.
Therefore, the answer is option D. 6 × 10² is not written in scientific notation.