Question

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

95 × 105
95 × 1010
9.5 × 105
9.5 × 1010

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* 10^5`

Explanation:

The given exponents :
`4.2*10^5` and
`5.3*10^5`

When we add them together , we get

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

Hence, the sum of
`4.2*10^5` and
`5.3*10^5=9.5* 10^5`