Use scientific notation to multiply the following two numbers. Express the answer using scientific notation; retain all nonzero decimal places

Question

(1.9 • 10^4) • (8.4 • 10^5)

Answer 1

1.9 * 8.4 * 10^(4+5)
= 15.96 * 10^9
= 1.596 * 10^10

Answer 2

(8.1 . 10^8) . (4.2 . 10^3)