Let x(n) = {2,4,-3,x(0)=1,-5,4,7}. Generate and plot the samples (use the stem function) of the following sequences. 1. x1(n) = 2x(n − 3) + 3x(n + 4) − x(n)
2. x2(n) = 4x(4 + n) + 5x(n + 5) + 2x(n)
3. x4(n) = 2e0.5nx(n) + cos (0.1π n) x (n + 2) , −10 ≤ n ≤ 10

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?