How do you calculate #(2.1 times 10^-4)(2.0 times 10^-5)#?

1 Answer
Tazwar Sikder
Aug 6, 2017

#4.2 times 10^(- 9)#

Explanation:

We have: #(2.1 times 10^(- 4))(2.0 times 10^(- 5))#

#= 2.1 times 10^(- 4) times 2.0 times 10^(- 5)#

Using the laws of exponents:

#= 2.1 times 2.0 times 10^(- 4 + (- 5))#

#= 4.2 times 10^(- 9)#

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