Question

Question #abbbc

Answer 1

`A. -1.9 * 10^3`
`B. 1.0279 * 10^9`
`C. 3.4 * 10^4`
`D. 2.12 * 10^6`

Explanation:

Significant figures include all digits of a measured quantity including the uncertain one.

The following are the rules on how to "count" significant figures:

1. All nonzero digits are significant.
   2.Zeros at the beginning of a number are never significant.
   ex. 0.02 has only 1 significant figures; 0.0026 has 2 significant figures
2. Zeros at the end of a number are significant if the number contains a decimal point.
   ex. 0.0200 has 3 significant figures; 3.0 has 2 significant figures
3. Zeros between nonzero digits are significant.
   ex. 1.03 has 3 significant figures; 50007 has 5 significant figures

In calculations,

1. Addition and subtraction:
   The results should have the same number of decimal places as the measurement with the fewest decimal places.
2. Multiplication and division:
   The results should have the same number of significant figures as the measurement with the fewest significant figures.

Hope this helps! :)