You didn’t say what you’re supposed to do with this. The form is known as Scientific Notation. Please read about this in your book.
Likely you’re supposed to change it to decimal form. In this case, consider the exponent on the 10: -8 [BTW, write this as 10^(-8).] To change 5.7*10^(-8) to decimal form, move the decimal point on the 5.7 eight spaces. Since the exponent is negative, move the decimal to the left: