Whether the Ninth Circuit properly dismissed the appeal without articulating the factors it found to base its conclusion that the plea and waiver were voluntary

Question Presented for Review The petitioner (criminal defendant below) claimed that his plea was involuntary, so therefore his appellate waiver was involuntary. The District Court denied petitioner's motion to withdraw his plea. Could the Ninth Circuit properly dismiss the appeal, under the circumstances of this case, without articulating the factors it found to base its conclusion that the plea and waiver were voluntary? i