i need help with 13-6 and 13-7

13-6. $15,000 Quarterly 4 years 8% 137. Check Problem 13-5 without the use of Table 13.2. Complete the following using Table 13.2 or the Business Math Handbook for the present value of an ordinary annuity: LU 13-2(1) Amount of Present value (amount annuity Interest needed now to invest expected Payment Time rate to receive annuity) 13-5. $900 Annually 6% 4 years 13-6. $15.000 Quarterly 4 years 8% 13-7. Check Problem 13-5 without the use of Table 13.2