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30 points i need an answer asap please…

Which of the following expressions is correctly written in scientific notation?

3.28 10-4

16.4 x 103

0.71 x 10-5

6.722

Respuesta :

Answer:

option number 1

Step-by-step explanation:

scientific notation is in form of

a × 10^b

where decimal in a should be after first number. and a should be none zero term