b)
8 * 8 + 3 * 2 * 2 * 2 = 64 + 3 * 8 = 64 + 24 = 88
c)
5² + 5 * 8 = 25 + 40 = 65
d)
3 * (5 * 5 + 2 * 2 * 2) = 3 * (25 + 8) = 3 * 33 = 99