Please solve this using excel

Numerically solve for: 1. Steady state temperature distribution when one surface is exposed to a constant heat flux and the other surface is insulated. 2. Steady state temperature distribution with specified flux at one end and convective cooling at the other end (i.e., h, T. is specified at the other end). 3. Steady state temperature distribution when one surface is exposed to a constant heat flux, the other surface is insulated and the body has a temperature dependent heat sink that varies as: -h (T-T..)*(Area/Volume). This is a rectangular fin. Heat transfer coefficient (h) = 100 W/m-K Cooling air temperature (T.) = 300 K Area/Volume = 2000 (1/m) =