I got so confused about these questions. please take a look and figure out for me. thanks

Charles has been purchasing $25,000 worth of Liquid Ink stock annually for the past 11 years. His holdings are now worth $581,844. What is his annual rate of return on this investment? An insurance annuity offers to pay you $1,000 per quarter for 20 years starting immediately. If you want to earn an effective annual rate of return (EAR) of 6.5 percent, what is the most you are willing to pay as a lump sum today to obtain this annuity? $44,591.11. You selected this answer. This morning, you borrowed $162,000 to buy a house. The mortgage annual rate is 4.35 percent. The loan is to be repaid in equal monthly payments over 20 years with the first payment due one month from today. Assume each month is equal to 1/12 of a year and all taxes and insurance premiums are paid separately. How much of the tenth payment applies to the principal balance