It seems that the text extraction wasn't successful due to the quality of the image or other factors. However, I can manually interpret the mathematical expressions from the image:

The image shows the following equations:

1. $F(C, M, D) = M + D$
2. $F(C, M, D, B) = \frac{M^2 + F}{B}$
3. $F(M, D, B) = \sum_{n=1}^{\infty} \frac{1}{M^n + D^5}$ (condition: $F \text{ if } \frac{\Theta}{B}$, where $\Theta = 6$)

Let’s go over each equation:

1. $F(C, M, D) = M + D$ — This appears correct and straightforward, just adding $M$ and $D$.

2. $F(C, M, D, B) = \frac{M^2 + F}{B}$ — This also looks correct algebraically. The function $F$ on the right-hand side might be referencing a previous value.

3. $F(M, D, B) = \sum_{n=1}^{\infty} \frac{1}{M^n + D^5}$ — The infinite sum seems mathematically valid, but without further context (like convergence), it’s hard to verify its correctness entirely. Additionally, the conditional part $F \text{ if } \frac{\Theta}{B}$, where $\Theta = 6$, may involve additional conditions that aren't fully clear.

The main structure of the math seems correct but depends heavily on assumptions, such as whether all terms are defined appropriately (e.g., the function $F$, and whether any convergence issues exist for the sum).

Would you like further clarification on a specific part, or help to review any part of these equations?

Here are 5 related questions you may want to explore:

1. What are the conditions for convergence in an infinite sum like the one shown?
2. Could there be an alternative interpretation for the function $F$?
3. How does the value of $\Theta = 6$ influence the final condition?
4. Is there a missing definition for the function $F$ from previous context?
5. What kind of variables (e.g., real, integer) are $M, D, B, F$ assumed to be?

Tip: When dealing with sums like $\sum_{n=1}^{\infty} \frac{1}{M^n + D^5}$, check whether the series converges or diverges before using it in calculations.