Question: How many former members from the band where Zack De La Rocha was a rapper/vocalist took part in the Audioslave discography? 
Sentence (from "Audioslave discography"): Supported by five singles, all of which reached the top ten of the "Billboard" Mainstream Rock Songs chart, "Audioslave" was certified triple platinum by the Recording Industry Association of America (RIAA).
Relevant evidence: Yes