To assist you accurately, I'll walk you through the general steps for solving part 4 based on the information visible in your image. However, if you'd like me to provide a more precise answer, please clarify the specific question details or upload a clearer image focusing on the question text for part 4.

Here's the process we typically follow for scientific notation calculations:

1. Identify the numbers in the question: Locate the values that need to be expressed or manipulated in scientific notation.
2. Convert to scientific notation: Each number should be in the form $a \times 10^n$, where $a$ is a number between 1 and 10, and $n$ is an integer.
3. Apply the operations: If multiplication is required, multiply the numbers and add the exponents; for division, divide the numbers and subtract the exponents.
4. Round to the correct precision: After performing the calculation, round the result to one decimal place as specified.
5. Express the answer: Ensure the answer is in the requested format, with appropriate symbols (e.g., $\times$).

Please provide the specific details from part 4 or a focused image so I can assist with the exact answer.

If you have other questions, here are five relative examples to explore:

1. How do you convert large or small numbers into scientific notation?
2. What are the rules for multiplying numbers in scientific notation?
3. How do you determine the correct number of significant figures when rounding?
4. What is the process for dividing numbers in scientific notation?
5. When adding numbers in scientific notation, what is the best approach for aligning powers of ten?

Tip: Always keep all decimal places during intermediate steps and round only at the final answer for better accuracy.