Question

Someone can help me please?

Answer 1

19 x 10^12 = 1.9 x 10 ^13

23 x 10^8 = 2.3 x 10^9

23 x 10^7 = 2.3 x 10^8

19 x 10^-12 = 1.9 x 10^-11

23 x 10^-8 = 2.3 x 10^-7

23 x 10^-7 = 2.3 x 10^-6

Explanation: