Final answer:
Stacy's account balance after 15 weeks is calculated by adding her initial deposit of $100 to 15 weekly deposits of $25 each, totaling $475.
Step-by-step explanation:
Calculating the Total Account Balance
To determine how much money Stacy will have in her account after 15 weeks, we need to consider both her initial deposit and the additional weekly deposits. Stacy starts with a $100 deposit. Then she adds $25 every week for 15 weeks. This situation does not involve simple interest as none was mentioned in the scenario provided.
The total amount deposited over the 15 weeks can be calculated by the formula: initial deposit + (weekly deposit × number of weeks).
The weekly deposit is $25 for 15 weeks, so she deposits an additional 25 × 15 = $375 over that period. The total amount in her account after 15 weeks will be the initial $100 deposit plus the $375 from the weekly deposits, which equals $475.