Final answer:
To determine Billy's initial account balance before depositing $6500.00, subtraction is used leading to an initial balance of $2,002.75.
Step-by-step explanation:
To find out how much Billy had in his account initially, we need to subtract the deposit from the final balance. The operation we use is subtraction because we are taking away the amount of the deposit. So, the initial amount in Billy's account can be calculated as:
Initial amount = Final balance - Deposit
Initial amount = $8,502.75 - $6,500.00
Initial amount = $2,002.75
So, if we subtract the amount of the deposit from his new balance, we can find the original balance. The operation we use is this:
Initial balance + Deposit = New balance
Initial balance = New balance - Deposit
Initial balance = $8,502.75 - $6500.00
Initial balance = $2,002.75
Therefore, Billy had $2,002.75 in his account initially before the deposit.