Answer:
3*10⁹ + 5.3*10¹⁰ = 5.6*10¹⁰
Step-by-step explanation:
The values are given as exponents:
3*10⁹ and 5.3*10¹⁰
As per the rules:
-Before adding two numbers, all exponents must be the same
-The addition takes place between the numerical portion of the numbers
- The final value is rounded off to the least places in the decimal portion of the given numbers
Therefore, the two numbers to be added are:

Rounded off the final value to 1 decimal place gives:
5.6*10¹⁰