It seems like you're presenting a mathematical expression, but it looks incomplete or unclear. From what I can gather, you have:

• $D = \frac{5}{4}$
• $a + h$

Could you clarify what you'd like to do with this expression? Are you solving for something, or are you looking for simplification, a formula, or a graph? Let me know how you'd like to proceed!

If this is part of a larger problem, feel free to share more details.

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Questions to consider:

1. Are you trying to solve for $a$ or $h$?
2. Is there an equation involving $D$, $a$, and $h$ that you're working on?
3. Should the fraction $\frac{5}{4}$ be used in relation to $a + h$?
4. Would you like a step-by-step solution or explanation for this problem?
5. Is there any additional context or specific operation you're looking for (e.g., substitution, solving, factoring)?

Tip: When presenting equations, make sure all parts of the equation are clear so it can be easily interpreted and solved!