Question

http://static.k12.com/bank_packages/files/media/mathml_a3f91238ea5033522660ac6e1c8ad558b8338c1f_1.gif

Answer 1

multiply 1.9 by 2.3; and multiply 10^3 by 10^4. The product of the two is your answer.

Answer 2

a^x(a^y) = a^(x+y).

Answer 3

1.9*10^3 * 2.3*10^4

First, recognize 3+4 = 7
Next, multiple 1.9 by 2.3 to get 4.37
Next put them together.
4.37x10^7