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which number is not in scientific notation? URGENT! BRAINLIEST WILL BE GIVEN

1) 11 . 10^21
2) 5.7 . 10^9
3) 3.1 . 10^-12
4) 1.67 . 10^-5

Respuesta :

Answer:

1) 11 x 10^21

Step-by-step explanation:

Scientific notation must be in the form

a  x 10^b

Where a is an number between 1 and 10

Clearly the 1st one is above 10 so it goes against the rule of scientific notation

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