(6.0 x 105) x (3.0 x 104) =
• 18 x 1020
• 18 x 109
• 1.8 x 1020
• 1.8 x 1010
To multiply two numbers in scientific notation, you need to multiply the two coefficients (the numbers in front of the "x") and then add the exponents.
In this case, we have:
First number: 6.0 x 10^5
Second number: 3.0 x 10^4
Multiplying the coefficients 6.0 and 3.0 gives us 18. The sum of the exponents 5 and 4 gives us 9.
Therefore, the answer is 18 x 10^9.
So the correct option is: 18 x 10^9.