For determining bridging carbonyls:
• Examine the geometry and bonding of the complex.
• Bridging carbonyls are shared between two metal centers, while terminal carbonyls are bonded to a single metal atom.
1. Bridging Carbonyls in W(CO)6:
- Tungsten hexacarbonyl (W(CO)6) has an octahedral geometry, and all carbonyl ligands are terminal.
- Number of bridging carbonyls: 0.
2. Bridging Carbonyls in Mn2(CO)10:
- Manganese decacarbonyl (Mn2(CO)10) has a metal-metal bond with all carbonyls being terminal in its structure.
- Number of bridging carbonyls: 0.
3. Total Bridging Carbonyls:
- Sum = 0 + 0 = 0.
Complete the following reactions by writing the structure of the main products: 
Let one focus of the hyperbola \( H : \dfrac{x^2}{a^2} - \dfrac{y^2}{b^2} = 1 \) be at \( (\sqrt{10}, 0) \) and the corresponding directrix be \( x = \dfrac{9}{\sqrt{10}} \). If \( e \) and \( l \) respectively are the eccentricity and the length of the latus rectum of \( H \), then \( 9 \left(e^2 + l \right) \) is equal to: