Final answer:
The number 3:6 × 10^5 can be expressed in scientific notation as 3.6 × 10^5, which is equal to 360,000.
Step-by-step explanation:
The number 3:6 × 105 can be expressed in scientific notation as 3.6 × 105. This means that the number is equal to 3.6 times 100,000 or 360,000.
Therefore, the correct answer is A. 360,000.