Subtract \( \frac{28.8}{\pi} \approx 9.17 \), so \( h^{5/2} \approx 489.65 \) → \( h \approx (489.65)^{2/5} \approx (489.65)^{0.4} \approx 14.3 \) — but check: 12 to lower? Wait: negative sign means decreasing.