Question

Choose the scientific notation that best represents the standard notation given. 6,840,000,000 m 68.4 x 108 m 6.84 x 108 m 6.84 x 10-9 m 6.84 x 109 m

Answer 1

ANSWER

$6.84\times 10^9$

EXPLANATION.

To write in scientific notation means , we write in form,

$k\times 10^n$

Where n is an integer and

$1\le k\:$

The given number is,

$6,840,000,000$

We move the decimal point backward to obtain our k, the n here is 9, because we moved backward 9 times.

This implies that,

$6,840,000,000=6.84\times 10^9$

The correct answer is D

Answer 2

Answer:

first question its D 6.84 x 10^9 m      Second is B 1.43 x 10^-10 g

Explanation: