PLEASE!! answer these 3 questions fast I greatly appreciate it

Jeremy invests $9,100 into an account with a 2.6% interest rate that is compounded quarterly. How much money will be in this account after 6 years? Round your answer to the nearest cent. Do NOT round until you have calculated the final answer. Provide your answer below: An investment pays 21% interest compounded weekly. What percent, as a decimal, is the effective annual yield? Enter your answer as a decimal rounded to four decimal places. Provide your answer below: Mary invests $550 in a high-interest savings account. In the first year, the value of her savings increases by 8%. In the second year, there is a further increase of 8%. What is the total value of her investment after two years? Round your answer to the nearest dollar. Provide your answer below