Let's break down and solve the problems presented in the image.

We are tasked with matching numerical solutions to various expressions. Each answer is associated with the following options:

• A: 2.9
• B: 2.1
• C: 2.75
• D: 6.58
• E: 67.21
• F: -16.53

The questions are:

1. A rational number equivalent to $\frac{7^3}{4}$.
2. $8.7 \times (-1.9)$.
3. $7.1 - (21 \div 5)$.
4. $(8.3 + 4.9) \times (13.51 \div 3)$.
5. $\sqrt{4.41}$.

Solving each expression:

1. $\frac{7^3}{4}$: $7^3 = 343$ $\frac{343}{4} = 85.75$ None of the choices directly match this, so this could be a mismatch or a misinterpretation.

2. $8.7 \times (-1.9)$: $8.7 \times (-1.9) = -16.53$ This matches option F.

3. $7.1 - (21 \div 5)$: $21 \div 5 = 4.2$ $7.1 - 4.2 = 2.9$ This matches option A.

4. $(8.3 + 4.9) \times (13.51 \div 3)$: $8.3 + 4.9 = 13.2$ $13.51 \div 3 = 4.5033$ $13.2 \times 4.5033 = 59.43$ This seems to not match exactly any of the options.

5. $\sqrt{4.41}$: $\sqrt{4.41} = 2.1$ This matches option B.

Summary of matches:

1. No match (but seems like a larger value, possibly misaligned question).
2. F: -16.53
3. A: 2.9
4. No match, but closer to 59.43.
5. B: 2.1

Would you like further clarifications or a deep dive into any specific problem?

Here are 5 related questions:

1. How would you solve for a cube root of a large number?
2. Can you explain the process of simplifying rational expressions?
3. How do you deal with negative numbers in multiplication?
4. What is the importance of order of operations in mathematical expressions?
5. How can you estimate square roots without a calculator?

Tip: Always double-check the order of operations (PEMDAS) to ensure calculations are done in the correct sequence!