urgent please

4. (20%) Solve these recurrence relations together with the initial conditions given . (10%), 50.-6.2.22: as I and a B (10%) - 70-16.12tw", 23, 2, 0, and 25 D 4. (20%) Solve these recurrence relations together with the initial conditions given A (10%) a. - Sa./ -6 ans, 22; --- and a; - 0 B. (10%) an=7an7-16 dxz+12 ans+n4", 123, 4, --2, 4, 50, and a2=5 5. (15 %) in the following figure (include graphs A, B, and C), determine whether the relation with the directed graph shown is an equivalence relation Explain the reason for each