17. If \[a + 2(x + 1) = s\], what is \[x + 1\], in terms of \[s\] and \[a\]?
(A) \[\frac{s}{2a}\]
(B) \[\frac{s - a}{2}\]
(C) \[\frac{s + a}{2}\]
(D) \[\frac{s}{2} - a\]
(E) \[\frac{s}{2} + a \]
sec1.18
18. The shaded region in the figure above is bounded by the \[x\]-axis, the line \[x = 4\], and the graph of \[y = f(x)\]. If the point \[(a,b)\] lies in the shaded region, which of the following must be true?
I. \[a \le 4\]
II. \[b \le a\]
III. \[b \le f(a)\]
(A) I only
(B) III only
(C) I and II only
(D) I and III only
(E) I, II and III

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