1. If x is negative and (x - 4)2 = 100, then x2 is equal to   196   -6   104   36   14   Hint Half-n-half Clue   2. If a and b are both odd numbers, then which of the following must be an odd number ?   a + b + 2   ab + 1   2a + b + 1   a + b   ab   Half-n-half Clue   3. A large water reservoir has two outlet pipes, a small one and a large one. It takes 9  hours to empty the reservoir when only the small outlet pipe is open. It takes 3  hours to empty the reservoir when only the large outlet pipe is open. About what fraction of the reservoir will be emptied in one hour if both the pipes are open?   0.22   cannot be determined   0.11   0.33   0.44   Half-n-half Clue   4. The arithmetic mean of 5, 11, and n is 16. What is the value of n?   16   32   cannot be determined   16   32   Half-n-half Clue