Multiple choice If x = y = 2z and xyz = 256, then what is the value of x? 12 8 16 6 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Given x = y = 2z and xyz = 256. Let z = k, then x = y = 2k. So xyz = (2k)(2k)(k) = 4k^3 = 256, giving k^3 = 64, so k = 4. Therefore x = 2k = 8.