Question

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)?
A. 5.0 × 103
B. 5.0 × 10-3
C. 5.0 × 1017
D. 5.0 × 10-17

Answer 1

That would be A.

2.5*2*10^(10-7)=5*10^3

Answer 2

Answer: The correct option is,

A. $5.0\times 10^3$

Explanation:

Given expression,

$(2.5\times 10^{10})\times (2.0\times 10^{-7})$

$=2.5\times 2.0\times 10^{10-7}$

( By using product property of exponent i.e. $a^m\times a^n = a^{m+n}$ )

$=5.0\times 10^3$

Therefore,

OPTION A is correct.