43 . D
Put everything in terms of log 2 :Of those two apparent solutions, one is impossible. The log of a negative number is
undefined, so x = 13 is an extraneous solution: You can’t take the log of (13 − 16). The only
solution is 20.44 . B
The cube is 6 × 6 × 6 , so its volume is 216. The sphere has radius 3, so
The difference is 216 − 36π ≈ 103.45 . A