91Ó°ÊÓ

The given is the numbers with significant figures

The objective is to round off the numbers and write with three significant figures

a.

To write the number $58.703\mathrm{g}$drop $3$ without increasing the digit $7$ by one with three significant figures since the first falling digit $0$ is less than $5$..

Thus, the number $58.703\mathrm{g}$ with three significant figures will be $58.7\mathrm{g}$.

The given is the numbers with significant figures

The objective is to round off the numbers and write with three significant figures

b.

To write the number $3×{10}^{-3}\mathrm{s}$Add two zeros after the decimal in the case of three significant digits $3×{10}^{-3}\mathrm{s}$Add two zeros after the decimal in the case of three significant digits $3×{10}^{-3}\mathrm{s}=3.00×{10}^{-3}\mathrm{s}$(3 significant figures)

So, the number $3×{10}^{-3}\mathrm{s}$with three significant figures will be $3.00×{10}^{-3}\mathrm{s}$.

The given is the numbers with significant figures

The objective is to round off the numbers and write with three significant figures

C.

Write the number $0.010826\mathrm{g}$ with three signiflcant flgures, drop $26$ without increase the digit $8$ by one because flrst dropping digit $2$ is less than $5$ .

So, the number $0.010826\mathrm{g}$ with three signiflcant flgures will be $0.0108\mathrm{g}$.