Option B is the greatest number , 1.997 x 10² .
An exponent is a number which is in the power of a number , called as base.
It is asked to find the which value is greatest among the options given
[tex]\rm 2.89 \times 10^{-8}\\\\1.997 \times 10 ^2\\\\8.9 \times 10^ {-6}\\\\5 \times 10 ^{- 6}\\\\[/tex]
As it can be seen from the options that all the numbers except option B has negative exponents which makes it a very small number , while the option B has positive exponent
Therefore Option B is the greatest number.
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