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The question is asking to find the expression with the least value among four choices, each written in scientific notation. Let's calculate each expression.

Given:

- **A**: \((4.7 \times 10^4) + (8 \times 10^4)\)
- **B**: \((7.08 \times 10^3) + (2.21 \times 10^7)\)
- **C**: \((5.43 \times 10^8) - (2.33 \times 10^9)\)
- **D**: \((9.35 \times 10^6) - (6.7 \times 10^6)\)

Let's solve each expression.

### Expression A:
\[
(4.7 \times 10^4) + (8 \times 10^4) = (4.7 + 8) \times 10^4 = 12.7 \times 10^4 = 1.27 \times 10^5
\]

### Expression B:
\[
(7.08 \times 10^3) + (2.21 \times 10^7)
\]
The second term is much larger than the first one, so:
\[
7.08 \times 10^3 \approx 0.000708 \times 10^7, \text{ so } (0.000708 \times 10^7) + (2.21 \times 10^7) = 2.210708 \times 10^7
\]

### Expression C:
\[
(5.43 \times 10^8) - (2.33 \times 10^9) = (0.543 \times 10^9) - (2.33 \times 10^9) = -1.787 \times 10^9
\]

### Expression D:
\[
(9.35 \times 10^6) - (6.7 \times 10^6) = (9.35 - 6.7) \times 10^6 = 2.65 \times 10^6
\]

Now, we compare the results:

- A: \(1.27 \times 10^5\)
- B: \(2.210708 \times 10^7\)
- C: \(-1.787 \times 10^9\)
- D: \(2.65 \times 10^6\)

### Conclusion:
Expression **C** has the least value, as it is the only negative value: \(-1.787 \times 10^9\).

Let me know if you'd like more details or have any other questions!

Here are 5 related questions:
1. What is scientific notation used for in mathematics?
2. How do you add or subtract numbers in scientific notation?
3. What is the importance of comparing powers of 10 in scientific notation?
4. How would you multiply two numbers in scientific notation?
5. Why does a negative exponent in scientific notation indicate a small number?

**Tip:** When adding or subtracting numbers in scientific notation, ensure that the powers of 10 are the same before performing the operation.

Solve the problem of determining which expression has the least value by using addition and subtraction in scientific notation. This example is suitable for students in Grades 7-10 and involves core concepts like scientific notation and powers of 10.

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