1) S = 2*(ab + ac + bc) = 2*(5*4 + 5*10 + 4*10) = 2*(20 + 50 + 40) = 2*110 = 220
2) V = h/3 * (a^2 + b^2 + ab) = 12/3 * (10^2 + 8^2 + 10*8) = 4*(100 + 64 + 80) = 4*244 = 976
3) S = (a + b)*n/2 = (10 + 40)*16/2 = 50*8 = 400
4) V = 1/3 abh = 1/3*30*20*25 = 200*25 = 5000