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Let's calculate the given expression:

\[
(3.9 \times 10^2) \times 10^7
\]

### Step-by-step process:

1. **Combine the powers of 10**: 
   \[
   10^2 \times 10^7 = 10^{2 + 7} = 10^9
   \]

2. **Multiply the numbers**: 
   \[
   3.9 \times 10^9
   \]

So, the result in standard form is:

\[
3.9 \times 10^9
\]

This is the answer in standard form.

Do you have any questions or would you like further details on any part?

Here are some related questions to consider:
1. How do you multiply numbers in scientific notation?
2. What is the general rule for multiplying powers of 10?
3. What is standard form, and how does it differ from expanded form?
4. How would the result change if the powers of 10 were negative?
5. Can you express large numbers like \(3.9 \times 10^9\) in words?

**Tip**: When multiplying powers of 10, you can simply add their exponents!

Calculate (3.9 × 10²) × 10⁷. Give your answer in standard form.

Learn how to calculate (3.9 × 10²) × 10⁷ and express the result in standard form. This problem demonstrates how to multiply numbers using scientific notation and manage exponents efficiently. Perfect for students in Grades 8-10.

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