# Question #abbbc

Sep 15, 2016

$A . - 1.9 \cdot {10}^{3}$
$B . 1.0279 \cdot {10}^{9}$
$C . 3.4 \cdot {10}^{4}$
$D . 2.12 \cdot {10}^{6}$

#### 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,