how do you write 0.00042 in a scientific notation

Answer 1

To write the number 0.00042 in scientific notation, you move the decimal point to the right until you have a number between 1 and 10.

For 0.00042, you move the decimal point 4 places to the right, which gives you 4.2. Since you moved the decimal to the right, you will use a negative exponent.

Thus, 0.00042 in scientific notation is:

\[ 4.2 \times 10^{-4} \]