p3sec1.15
15. If \[y = 60\] in \[\Delta DEF\] above, how much greater is the perimeter of \[\Delta ABC\] than the perimeter of \[\Delta DEF\]?
(A) 0
(B) 3
(C) 6
(D) 8
(E) 9

16. If \[x \] and \[y \] are positive consecutive odd integers, where \[y > x\], which of the following is equal to \[y^2 - x^2\]?
(A) \[2x\]
(B) \[4x\]
(C) \[2x + 2\]
(D) \[2x + 4\]
(E) \[4x + 4\]

17. In the \[xy\]-plane, line \[\ell \] passes through the origin and is perpendicular to the line \[4x + y = k\], where \[k\] is a constant. If the two lines intersect at the point \[(t, t + 1)\], what is the value of \[t\]?
(A) \[- \frac{4}{3}\]
(B) \[- \frac{5}{4}\]
(C) \[\frac{3}{4}\]
(D) \[\frac{5}{4}\]
(E) \[\frac{4}{3}\]

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