Please help with 3, 6 and 9.

Due to blockage of fluid flow, the convection heat transfer coefficient for the finned and prime surfaces of a fin array in general decreases as the number of fins increases. Consider the fin array shown below, with wall height of 12.0mm,w=12.0mm,t=1.2 mm, and L=12.0mm. The fins are aluminum and the base and environment temperatures are Tb=95C and T=20C. As a first approximation, assume h=hmax(1N/Nmax) where Nmax is the maximum number of fins that can be placed on a surface, so that Nmax=12.0mm/1.2mm=10. For hmax=50W/m2K, determine the total heat rate, in W, for N=0,3,6, and 9 fins. Nqtot(W) 0 3 6 9