Question

The length of the Amazon River in South America is 6,400 kilometers. What is the length written in scientific notation?

6.4 x 102 km
64 x 102 km
6.4 x 103 km
6.4 x 105 km

Answer 1

`6.4 * 10^(3) km`

Explanation:

Scientific notation can be defined as a way of expressing and writing a very small or large real number in decimal form. Generally, to use the scientific notation, we will multiply the real number by a power of 10.

Given that the length of Amazon River is 6,400 kilometers.

`(6400)/(1000) = 6.4`

`1000 = 10^(3)`

Therefore,

6, 400 kilometers = 6.4 × 10³ kilometers.