Which of the following is not written in scientific notation? (1 point)
1.8 x 10^4
0.5 x 10^-12
7.23 x 10^-3
6 x 10^2
6 x 10^2
To determine which of the given numbers is not written in scientific notation, we need to understand the format of scientific notation. Scientific notation is a way to express very large or very small numbers using powers of 10.
In scientific notation, a number is usually written in the form of A x 10^B, where A is a number between 1 and 10 (inclusive), and B is an integer.
Let's analyze each given number:
1.8 x 10^4: This is written in scientific notation, as it follows the format: 1.8 is between 1 and 10, and 4 is an integer exponent.
0.5 x 10^-12: This is also written in scientific notation. Though 0.5 is less than 1, it is still between 0 and 1. Additionally, -12 is a negative integer exponent.
7.23 x 10^-3: This number is written in scientific notation. The number 7.23 is between 1 and 10, and the exponent -3 is a negative integer.
6 x 10^2: This number is NOT written in scientific notation, as it does not follow the format mentioned earlier. The number 6 is between 1 and 10, but the exponent 2 is not an integer.
Therefore, the number "6 x 10^2" is the one that is NOT written in scientific notation.
To determine which expression is not written in scientific notation, we need to understand what scientific notation is. Scientific notation is a way to write numbers that are either very large or very small in a simplified form.
Scientific notation consists of two parts: a coefficient and a power of 10. The coefficient is a number between 1 and 10, and the power of 10 indicates how many places the decimal point needs to be moved to get the original number.
Let's analyze each expression to see if it fits the criteria for scientific notation:
1. 1.8 x 10^4: This expression is in scientific notation because the coefficient (1.8) is between 1 and 10, and the power of 10 (4) indicates that the decimal point needs to be moved four places to the right.
2. 0.5 x 10^-12: This expression is also in scientific notation. Although the coefficient (0.5) is less than 1, it is between 0.1 and 1. Additionally, the negative power of 10 (-12) indicates that the decimal point needs to be moved twelve places to the left, making the number very small.
3. 7.23 x 10^-3: This expression is again in scientific notation. The coefficient (7.23) is between 1 and 10, and the negative power of 10 (-3) indicates that the decimal point needs to be moved three places to the left.
4. 6 x 10^2: This expression is not in scientific notation. Even though the coefficient (6) is between 1 and 10, there is no power of 10 indicated. In scientific notation, there must be both a coefficient and a power of 10 present.
Therefore, the expression "6 x 10^2" is not written in scientific notation.