Question

Which of the following expressions is written in scientific notation?

a) 0.2 x 10⁻⁵
b) 31.4 x 10⁴
c) 0.1 x 10³
d) 13 x 10⁴

Answer 1

The correct scientific notation is (31.4 times 10^4), conforming to the standard where a decimal between 1 and 10 is multiplied by a power of 10. Other options lack this structure.

Step-by-step explanation:

In scientific notation, a number is written as the product of a decimal number between 1 and 10 and a power of 10. The correct expression in scientific notation is: a) 31.4 x 10⁴. This expression is in the form of a decimal number (31.4) multiplied by a power of 10 (10⁴), which is typical of scientific notation. The other expressions are not in scientific notation because they do not have the required decimal number between 1 and 10 multiplied by a power of 10.