10,11 and 12 pleaseee

30 In Problems 7-14, find i (the rate per period) and n (the number of periods) for each annuity 7. Quarterly deposits of $500 are made for 20 years into an an- nuity that pays 8% compounded quarterly. 8. Monthly deposits of $350 are made for 6 years into an annu- ity that pays 6% compounded monthly. 9. Semiannual deposits of $900 are made for 12 years into an annuity that pays 7.5% compounded semiannually. 10. Annual deposits of $2.500 are made for 15 years into an an- nuity that pays 6.25% compounded annually. 11. Monthly deposits of $235 are made for 4 years into an annu- ity that pays 9% compounded monthly. 12. Semiannual deposits of $1.900 are made for 7 years into an annuity that pays 8.5% compounded semiannually. 3 3 3