Question

What is (3.2 × 10^4) × (2 × 10^–2)?                                  A. 6.4 × 10^–8   B. 6.4 × 10^–2   C. 6.4 × 10^2   D. 6.4 × 10^8

Answer 1

$(3.2\ \times\ 10^4)\ \times\ (2\ \times\ 10^{-2})=3.2\ \times\ 2\ \times\ 10^{4+(-2)}\\\\=6.4\ \times\ 10^2\\\\\\Answer:C.$