By Mark I. Krusemeyer, George T. Gilbert, Loren C. Larson

This quantity is a republication and growth of the much-loved Wohascum County challenge ebook, released in 1993. the unique a hundred thirty difficulties were retained and supplemented via an extra seventy eight difficulties. The puzzles contained inside of, that are available yet by no means regimen, were specifically chosen for his or her mathematical charm, and particular recommendations are supplied. The reader will come upon puzzles related to calculus, algebra, discrete arithmetic, geometry and quantity concept, and the amount comprises an appendix making a choice on the prerequisite wisdom for every challenge. A moment appendix organises the issues via material in order that readers can concentration their realization on specific sorts of difficulties in the event that they want. This assortment will supply entertainment for professional challenge solvers and when you desire to hone their talents.

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**Example text**

Prove or disprove: If (x, y) is an L-point, then either x or y (or both) is an integer. (p. 287) 168. a. Find all lines which are tangent to both of the parabolas y = x2 and y = −x2 + 4x − 4. b. Now suppose f(x) and g(x) are any two quadratic polynomials. Find geometric criteria that determine the number of lines tangent to both of the parabolas y = f(x) and y = g(x). (p. 289) 169. Suppose we are given an m-gon (polygon with m sides, and including the interior for our purposes) and an n-gon in the plane.

275) 158. Suppose you form a sequence of quadrilaterals as follows. The first quadrilateral is the unit square. To get from each quadrilateral to the next, pick a vertex of your quadrilateral and a side that is not adjacent to that vertex, and then connect the midpoint of that side to that vertex. This will divide the quadrilateral into a triangle and a new quadrilateral; discard the triangle, and repeat the process with the new quadrilateral. (The second quadrilateral will be a rectangular trapezoid, for instance with vertices (0, 0), (1, 0), (1, 1/2), (0, 1).

Y=x y = x2 sin x x Suppose y = mx + b is the equation of a non-vertical line. Because mx + b = 0, x→∞ x2 lim we know that for x large enough mx + b < 1, x2 or equivalently −x2 < mx + b < x2 . Therefore, the line y = mx + b will intersect the graph y = x2 sin x in each interval (π/2 + 2kπ, 3π/2 + 2kπ) for sufficiently large integers k.