Mathematics

Problem

A stadium holds

6.0 \times 10^{4}

spectators. If the average mass per spectator is

70\,\text{kg}

, the approximate total mass of the crowd, expressed in scientific notation, is a)

4.2 \times 10^{5}\,\text{kg}

7.0 \times 10^{6}\,\text{kg}

4.2 \times 10^{6}\,\text{kg}

4.2 \times 10^{7}\,\text{kg}