Hello!! Your answer would be 3.33x10^-10. Since you are trying to find one place holder for the notation, you will move your decimal 10 times to the right for it to be in scientific notation. Always remember that for scientific notation, you must have one whole number in front of a decimal at all times. After you put the decimal after the first whole number, count how many times you have moved your decimal. If you have a lot of zeros in front of your numbers, you will always have a negative exponent, and if you have a negative exponent, then you will have a lot of zeros. If you have a whole number exponent, it will be up in the 100s, 1000s, or 10000s, something like that. It will have a high value with a higher exponent. I hope I helped!! If you have any more questions then do not hesitate to message me and let me know. Have a great day!! :)