sec3.15
15. The figure above shows the graphs of \[y = x^2\] and \[y = a - x^2\] for some constant \[a\]. If the length of PQ is equal to 6, what is the value of \[a\]?
(A) 6
(B) 9
(C) 12
(D) 15
(E) 18

16. Set \[X\] has \[x\] members and set \[Y\] has \[y\] members. Set \[Z\] consists of all members that are in either set \[X\] or set \[Y\] with the exception of the \[k\] common members \[(k > 0)\]. Which of the following represents the number of members in set \[Z\]?
(A) \[x + y + k\]
(B) \[x + y - k\]
(C) \[x + y + 2k\]
(D) \[x + y - 2k\]
(E) \[2x + 2y - 2k\]

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