Write equations for the darkened nodes in the grid in Figure. Note that all units are cgs. The convection coefficient is h_c = 0.015 cal/(cm² · C · s) and the thickness of the plate is 1.5 cm.

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k = 0.7 k'u 0.5 q. - 10 cal/cm/s Ar = 20 Ar 40 4 1= 0 Insulated Convection 4, = l,AT.- 7); T - 20°C 2. 3. Ay = 15 Ay = 30