To evaluate \( 3.7 \times 10^7 + 520,000 \), we first need to express \( 520,000 \) in scientific notation.
The number \( 520,000 \) can be expressed as: \[ 520,000 = 5.2 \times 10^5 \]
Now, we need to convert both terms to the same power of ten to add them together. The exponent \( 10^7 \) is larger than \( 10^5 \), so we will convert \( 5.2 \times 10^5 \) to a power of \( 10^7 \): \[ 5.2 \times 10^5 = 0.052 \times 10^7 \]
Now we can add: \[ 3.7 \times 10^7 + 0.052 \times 10^7 = (3.7 + 0.052) \times 10^7 \]
Calculating the sum inside the parentheses: \[ 3.7 + 0.052 = 3.752 \]
So we now have: \[ 3.752 \times 10^7 \]
Finally, we express this in scientific notation: \[ 3.752 \times 10^7 \]
Therefore, the final answer is: \[ \boxed{3.752 \times 10^7} \]