State the number of significant 2804, 2.84, 5.029, 0.0030681

Explanation:

Significant numbers generally helps in measurement to express the accuracy of recorded experimental figures.

In order to solve the problem, there are rules that guides the identification of significant figures.

Some of these rules are:

According to these rules, we can state the number of significant figures in the values:

2804      4 significant figures

2.84         3 significant figures

5.029       4 significant figures

0.0030681   5 significant figures

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).