Misc: In tennis, what name is given to a serve which cannot be returned?

Questions

Elvis: Elvis's personal number in numerology, which held great meaning for him?

Elvis: Listed as official cause of Elvis's death on his original death certificate?

Elvis: Strange 3-wheeled car manufactured in Germany, purchased by Elvis in 1956?

Elvis: The area at the rear of Graceland where Elvis & his parents are buried?

Elvis: This is misspelled on Elvis's grave marker?