Multiply or divide as indicated watching significant digits. (a) (6.5 ✕ 1018 m)(5.3 ✕ 10-10 m)

(b) (5.2 ✕ 10-7 m)/(3.2 ✕ 10-12 s)

(c) (8.5 ✕ 10-4 km)(1.3 ✕ 10-3 km)

(d) (6.6 ✕ 105 kg)/(3.3 ✕ 103 m3)