To find the sum of the populations of the two cities in scientific notation, we can first express both populations with the same exponent.
- The population of the first city is \(3.45 \times 10^6\).
- The population of the second city is \(1.3 \times 10^5\).
To add these two numbers, we need to express \(1.3 \times 10^5\) in terms of \(10^6\): \[ 1.3 \times 10^5 = 0.013 \times 10^6 \]
Now we can add the populations: \[ 3.45 \times 10^6 + 0.013 \times 10^6 = (3.45 + 0.013) \times 10^6 = 3.463 \times 10^6 \]
In scientific notation, we need to express \(3.463\) in a form that fits common conventions. It can be kept as \(3.463 \times 10^6\), but let's evaluate the provided options.
None of the answers explicitly show \(3.463 \times 10^6\). However, looking at the numerical value closely, it is approximately \(3.46 \times 10^6\). Since no approximate answer is provided, let's write the closest value available.
Among the provided answers, none are exactly correct, but if we were to round or check for any errors in the options provided, it would generally be reflective of significant figures or adjustments.
Despite not matching any, based on calculations: The most reasonable interpretation based on standard operations is \(3.46 \times 10^6\), which could be close to rounding but no direct option fits.
Given the specific question context, the most correct is \(3.45 \times 10^6\) is the base and could lead to \(3.463\) which is not exactly present but represents the summation logic. Verifying growing scientific powers cannot revert to options like \(4.75 \times 10^5\) as true as \(10^6\) has two magnitudes higher influence than \(10^5\).
Check calculations to derive proper figures; there has been some misplacement in how options correlate to raw output during logical scrolling through. The direct notation should depict clearly \(3.463 \times 10^6\) rather than fit any others undefined prior.