To solve the given expression, let's break it down step by step:

1. The summation notation $\sum_{4} 2^{-4/5}_2$:

   • $\sum_{4}$ indicates a summation from an index (likely from 1 to 4).
   • $2^{-4/5}_2$: It is unclear whether this notation represents a fractional exponent combined with a summation range. Could you confirm the variable limits or context?

2. The alpha ($\alpha$) and $\pi^2$:

   • $\pi^2 = -\frac{4}{4\%}$: This implies solving $\pi^2$ based on a percentage term ($4\% = 0.04$).

Could you clarify any missing summation limits or provide further explanation about the symbols (e.g., is $2^{-4/5}$ a function or constant for summation)? This will help resolve the entire problem comprehensively.

Here are five relevant questions to expand the explanation:

1. Are there any summation limits to specify (e.g., from $n = 1$ to $n = 4$)?
2. Should $2^{-4/5}$ be treated as a fixed base raised to an exponent?
3. What does $\alpha$ represent? Is it a known constant or variable?
4. Does $\pi^2$ have additional context beyond the provided equality?
5. Should the summation account for iterative computation for specific $n$-values?

Tip: For mathematical clarity, always label terms or operations explicitly to avoid ambiguity when combining symbols. Let me know if you'd like further clarification!