Question

Evaluate. Express your answer in scientific notation.
3.91 x 10^5 + 7.43 x 10^6

Answer 1

To add these numbers in scientific notation, we need to ensure that the exponents are the same.

We can rewrite 3.91 x 10^5 as 0.391 x 10^6 (move the decimal point one place to the left) to make the exponents the same.

Now we can add the numbers:

0.391 x 10^6 + 7.43 x 10^6 = (0.391 + 7.43) x 10^6 = 7.821 x 10^6

Therefore, the answer is 7.821 x 10^6.