Suppose that the computer in office 2 and the computer in office 3 had been bought in the same year as each other. If...

The explanation video for Q1 here cannot be found in the "resume" or "retake." Only when I clicked "review," then on the separate question. Even then, the button "explanation" on Q1 can disappear. Come on man. This is bunch of money for such an unreliable webpage.