need help in the number 2 and number 5

A. In Problems 1-8, find i (the rate per period) and n (the number of periods) for each loan at the given annual rate. 1. Monthly payments of $245.65 are made for 4 years to repay a loan at 7.2% compounded monthly. 2. Semiannual payments of $3,200 are made for 12 years to repay a loan at 9.9% compounded semiannually. 3. Quarterly payments of $975 are made for 10 years to repay a loan at 9.9% compounded quarterly. 4. Annual payments of $1,045 are made for 5 years to repay a loan at 4.75% compounded annually. 5. Semiannual payments of $4,500 are made for 16 years to repay a loan at 5.05% compounded semiannually. 6. Quarterly payments of $610 are made for 6 years to repay a loan at 8.24% compounded quarterly. 7. Annual payments of $5,195 are made for 9 years to repay a loan at 5.48% compounded annually. 8. Monthly payments of $433 are made for 3 years to repay a loan at 10.8% compounded monthly. Applicitions 21. American General offers a 10 -year ordinary annuity with a guaranteed rate of 6.65% compounded annually. How much should you pay for one of these annuities if you want to re