Question

Write 0.0004571 in scientific notation.

Answer 1

4.571 X 10^-4

you do this by moving the decimal until there is no zeros, to the left of the decimal point.

Answer 2

scientific notation means to write the answer in standard form. standard form helps you to express numbers that are too big or too small to be conveniently written in decimal form.
so for this case, it will be 4.571×10^-4.
when the number is decimal, you move the dot to the right and it will always be multiplying 10 to the power of a negative power.