part and affirm in part. 1. We must raise issues of mootness sua sponte. Gator.com Corp. v. L.L. Bean, Inc., 398 F.3d 1125, 1129 (9th Cir. 2005) (en banc). Ackerman admitted that, by May 2013, the Nevada Department of Corrections served food that was properly certified as kosher by an appropriate rabbinic organization. Ackerman did not file a motion to re-certify the class and did not oppose Defendants’ motion to dismiss the case. And Ackerman states in his opening brief that he prevailed in the district court. Thus, Ackerman’s claims are moot, and we lack jurisdiction to consider Ackerman’s appeal of the district court’s denial of a proposed class action settlement and de-certification of the stipulated class. See Tate v. Univ. Med. Ctr. of S. Nev., 606 F.3d 631, 634 (9th Cir. 2010) (<HOLDING>). 2. The district court’s decision denying a
holding that the court lacks jurisdiction to review legal arguments not raised before the bia holding that this court lacks jurisdiction to review claims that have not been raised before the bia recognizing that a federal court is obliged to dismiss a case whenever it appears the court lacks subject matter jurisdiction recognizing that sanctions are collateral to the merits of the case and may be considered even after the merits are no longer before the district court holding that a court lacks jurisdiction when the issues in a case are no longer live