Question

Express in scientific notation. Choose the answer with the proper number of significant figures.

(3x10^4) (4x10^23)

A: 10x10^27
B: 1x10^28
C: 12^27
D: 12x10^27

Answer 1

The answer is d

This is because the 3 is distributed to the 4 to get 12. The 10^4 is distributed to the 10^23 and because of the exponent laws, the exponents are added to get 27 and the 10's (being the base) is left alone.