Question

What is the sum of 4.2 × 105 and 5.3 × 105?

Answer 1

The answer would be 9.5•105. You are supposed to add the beginning numbers since the second numbers are equal to each other meaning that the first numbers are of the base values.

Answer 2

Answer: $9.5\times 10^5$

Step-by-step explanation:

The given exponents : $4.2\times10^5$ and $5.3\times10^5$

When we add them together , we get

$4.2\times10^5+5.3\times 10^5 \\\\=(4.2+5.3)\times10^5\ \ \text{[By using distributive property } ba+ca=(b+c)a]\\\\= 9.5\times10^5$

Hence, the sum of $4.2\times10^5$ and $5.3\times10^5=9.5\times 10^5$