Answer:
8x + 25 = 505
Explanation:
He started with $25.
Each month, he deposits the same amount, but we don't know that amount.
Let's call the unknown amount of the monthly deposit x.
In 8 months, he deposited 8x.
We add 8x to the first deposit of $25 to get 8x + 25.
That must equal the total amount of money in his account after 8 months.
8x + 25 = 505
The equation is 8x + 25 = 505.