Question

What is the result of adding 2.5 × 103 and 3.5 × 102?

a. 2.9 × 103
b. 6.0 × 105
c. 6.0 × 103
d. 2.9 × 102

Answer 1

2.5×103 and 3.5 x 102=6.0x103

Answer 2

The correct answer is option (a).

Step-by-step explanation:

`(2.5* 10^3)+(3.5* 10^2`

Taking
`10^2` common form both brackets:

`=10^2((2.5* 10)+(3.5* 1))`

Taking 5 common form both brackets:

`=10^2* 5((0.5* 10)+(0.7* 1))`

`=10^2* 5(5.0+0.7)=10^2* (28.5)`

`=2.85* 10^3\approx 2.9 10^3`[

Hence,the correct answer is option (a).