1) b4 = b1*q^3
b4 = -32*1/2^3
b4 = -32*1/8
b4 = -4
2) S5 = -32((1/2)^5-1)/1/2-1 = -32(1/32-1)/1/2-1 = -1+32/-1/2 = 31*2 = 62
1) b4 = b1*q^3
b4 = -32*1/2^3
b4 = -32*1/8
b4 = -4
2) S5 = -32((1/2)^5-1)/1/2-1 = -32(1/32-1)/1/2-1 = -1+32/-1/2 = 31*2 = 62