It is: 12.66
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1050 contains 4 significant digits and cannot be rounded to two significant figures without changing the value of the number.
1.246(10^8) I believe.
There are 4 significant digits
4 significant figures.
The number 5.400 has four significant figures. In a decimal number, all non-zero digits are considered significant. The zeros between the non-zero digits are also significant. Therefore, all the digits in 5.400 are significant, making it a four-significant-figure number.