I cannot figure out this two question, I've tried but I cannot figured it out and my assignment is due tonight. Can someone show how it is done on excel?

Derek wants to withdraw $10,615.00 from his account 7.00 years from today and $12,496.00 from his account 15.00 years from today. He currently has $3,555.00 in the account. How much must he deposit each year for the next 15.0 years? Assume a 6.16% interest rate. His account must equal zero by year 15.0 but may be negative prior to that. Submit Answer format: Currency: Round to: 2 decimal places. unanswered not_submitted Attempts Remaining: Infinity #3 Derek currently has $10,730.00 in an account that pays 6.00%. He will withdraw $5,101.00 every other year beginning next year until he has taken 7.00 withdrawals. He will deposit $10730.0 every other year beginning two years from today until he has made 7.0 deposits. How much will be in the account 30.00 years from today? Submit Answer format: Currency: Round to: 2 decimal places