Answer:
To add two numbers that are written in scientific notation, we need to make sure that they have the same power of 10. Then we can add the coefficients and keep the same power of 10. The formula for adding two numbers in scientific notation is:
a×10b+c×10b=(a+c)×10b
where a and c are the coefficients and b is the power of 10. Using this formula, we can calculate the answer to the question as follows:
(6.77×103)+(5.85×103)=(6.77+5.85)×103
(6.77×103)+(5.85×103)=12.62×103
Therefore, the answer is 12.62 x 10^3.