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The problem you're asked to solve is:

\[
(8.6 \times 10^6) + (4.1 \times 10^6)
\]

### Solution:

Both terms are in the form \( a \times 10^6 \), so you can simply add the numbers \( 8.6 \) and \( 4.1 \):

\[
8.6 + 4.1 = 12.7
\]

Now, multiply this result by \( 10^6 \):

\[
12.7 \times 10^6 = 1.27 \times 10^7
\]

Thus, the final answer in standard index form is:

\[
1.27 \times 10^7
\]

Would you like more details or have any questions?

### Related Questions:
1. How do you add numbers in standard form when the powers of 10 are different?
2. What are the steps to multiply numbers in standard form?
3. How do you convert a number from standard form to ordinary notation?
4. Why is it useful to write numbers in standard form?
5. How do you subtract numbers in standard form?

**Tip:** When adding or subtracting numbers in scientific notation, ensure that the exponents of 10 are the same before combining the coefficients.

Calculate (8.6 × 10^6) + (4.1 × 10^6). Give your answer in standard index form.

Learn how to add numbers in scientific notation, such as (8.6 × 10^6) + (4.1 × 10^6), and express the result in standard index form. This problem is suitable for students in Grades 8-10.

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