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

(3 x 104) (4 x 1023) = _____

1227

12 x 1027

10 x 1027

1 x 1028

12x10^27

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To express the given expression in scientific notation, we need to multiply the coefficients and add the exponents.

Given:

(3 x 10^4) (4 x 10^23)

To multiply the coefficients, we have:

3 x 4 = 12

To add the exponents, we have:

10^4 x 10^23 = 10^(4+23) = 10^27

Therefore, the expression (3 x 10^4) (4 x 10^23) can be expressed in scientific notation as:

12 x 10^27

Since the given expression has two significant figures (3 and 4) and the final answer has two significant figures (12), the answer with the proper number of significant figures is:

12 x 10^27