Apple’s stay as the world’s only $3 trillion company was short-lived Friday — a day after the company reported its third consecutive quarter of declining sales due to weak iPhone demand. Shares of the Cupertino, Calif.-based tech colossus were down by nearly 3.5% as of 10 a.m. Eastern time on Friday — — lowering its market cap to a still robust $2.92 trillion. In the three-month period ended July 1 — Apple’s third quarter — it recorded a revenue of $81.8 billion, a 1.4% decline from Q2 and a year-over-year drop of 3%. The tech giant’s Chief Financial Officer Luca...