Which number is not in scientific notation?

three point four times ten to the negative first power

zero point four times ten to the fifth power

one point nine eight times ten to the negative twentieth power

eight times ten to the twelfth power

Question

Which number is not in scientific notation?

three point four times ten to the negative first power

zero point four times ten to the fifth power

one point nine eight times ten to the negative twentieth power

eight times ten to the twelfth power

anonymous · Answer

btw i didn't learn this I'm doing a pretest. but i have to get a good grade on it or ill be in biiiiiiig trouble.

anonymous · Answer

@mathstudent55 @dan815 can you guys help meeeee?

anonymous · Answer

zero point four times ten to the fifth power 
should be written 4 x 10^4

anonymous · Answer

thankyou sm @robtobey your awesome!!!

anonymous · Answer

You are welcome.

anonymous · Answer

Thank you for the medal.

anonymous · Answer

np:) lolol