Answer:
Line P bisects AD at O.
AD = AO + OD
(3z - 11) = (z + 4) + OD
(3z - 11) - (z + 4) = OD
3z - 11 - z - 4 = OD
2z -15 = OD
11.2 x 11 x 8 is 985.6
so uh- yeah i hope that helped lol