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To solve question 23, let's add the approximate diameters of Mercury and Venus.

1. **Mercury's diameter** = \( 4.88 \times 10^3 \) kilometers
2. **Venus's diameter** = \( 1.21 \times 10^4 \) kilometers

The sum of these diameters is:
\[
4.88 \times 10^3 + 1.21 \times 10^4
\]

To add these, convert each to the same power of 10, if necessary.

### Step-by-Step Calculation
1. Rewrite \(1.21 \times 10^4\) as \(12.1 \times 10^3\).
2. Now add \(4.88 \times 10^3 + 12.1 \times 10^3\):
   \[
   (4.88 + 12.1) \times 10^3 = 16.98 \times 10^3
   \]
3. This simplifies to \(1.698 \times 10^4\).

### Answer
The correct option is:
- **\(1.698 \times 10^4\)**.

Would you like further explanation or have additional questions?

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Here are five related questions for further practice:
1. What is the sum of the diameters of Earth and Mars?
2. What would the sum be for Mercury, Venus, and Earth?
3. How would you subtract the diameter of Mars from that of Earth?
4. What would the result be if you multiplied the diameter of Mercury by 10?
5. How would the sum change if we added the diameter of Jupiter instead of Venus?

**Tip:** When adding numbers in scientific notation, it’s easiest to convert them to the same power of 10.

If the planets were lined up next to each other, what would be the sum of the approximate diameters of Mercury and Venus?

Learn how to calculate the sum of the approximate diameters of Mercury and Venus by using scientific notation. This problem teaches students in Grades 6-8 how to add numbers expressed in scientific notation, with a step-by-step solution.

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