Write as a decimal number:

MATHEMATICS · Multi-part · CBSE · Mathematics · Power Play · Power Play

Problem

Write as a decimal number: (1) It is estimated that the population of the world in 2020 will be 7.4×1097.4 \times 10^9 people. (2) The mass of a Ryukyu mouse is 1.12×10−21.12 \times 10^{-2} kg. (3) The bacterium *bordetella pertussis* is about 5×10−75 \times 10^{-7} m long. (4) The Eiffel tower in Paris weighs approximately 7.3×1067.3 \times 10^6 kg.

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