please help solve the 3 exercises. this is an actuary type of exercise. You need to know the theory of interests before. thanks

8.-/1 points Suppose that the effective interest rate year is 1.5%. Determine the equivalent nominal interest rate, compounded every 9 years. Answer = % (in percents rounded to 2 decimal places.) 9.-/1 points Calculate the present value of $1,000 payable in five years using a discount rate of 7% convertible quarterly. Answer = $ (round your answer to 2 decimal places.) 10.0/1 points Previous Answers Calculate the accumulated value at the end of 4 years of $280 payable now assuming an interest rate equivalent to a discount rate of 12% convertible monthly. Answer = $ 172.84 x (round your answer to 2 decimal places.)