User contributions for Williamhu888

12:0412:04, 21 February 2014 diff hist +1 m 2014 AMC 10B Problems/Problem 21 →Solution

10:3110:31, 22 February 2013 diff hist 0 2013 AMC 10B Problems/Problem 24 →Solution
10:2510:25, 22 February 2013 diff hist +5 m 2013 AMC 10B Problems/Problem 2 No edit summary

19:3019:30, 2 November 2012 diff hist +24 2009 AMC 10A Answer Key No edit summary
19:3019:30, 2 November 2012 diff hist +140 N 2009 AMC 10A Answer Key Created page with "1. E 2. A 3. C 4. A 5. E 6. A 7. C 8. B 9. B 10. B 11. D 12. C 13. E 14. A 15. E 16. D 17. C 18. D 19. B 20. D 21. C 22. D 23. E 24. C 25. B"
19:2919:29, 2 November 2012 diff hist +28 2009 AMC 10A No edit summary
19:2719:27, 2 November 2012 diff hist +1 m 2009 AMC 10A Problems/Problem 18 →Solution 1
19:2419:24, 2 November 2012 diff hist +7 m 2009 AMC 12A Problems/Problem 5 →Solution
19:2419:24, 2 November 2012 diff hist +14 m 2009 AMC 12A Problems/Problem 5 →Solution
19:2419:24, 2 November 2012 diff hist +20 m 2009 AMC 10A Problems/Problem 10 →Solution
19:2319:23, 2 November 2012 diff hist +13 m 2009 AMC 10A Problems/Problem 9 No edit summary

21:5221:52, 1 November 2012 diff hist +2 m 2011 AMC 10A Problems/Problem 24 →Solution
21:5221:52, 1 November 2012 diff hist +7 m 2011 AMC 10A Problems/Problem 24 →Solution

21:2321:23, 28 October 2012 diff hist +2 m Right triangle →Special right triangles
21:2221:22, 28 October 2012 diff hist +80 m Right triangle →Special right triangles

19:2919:29, 19 August 2012 diff hist +29 m 1997 AIME Problems/Problem 11 →Solution 3

22:4122:41, 7 July 2012 diff hist 0 m 2012 AIME II Problems/Problem 9 →The Second Term

18:3618:36, 30 May 2012 diff hist +1 Vector No edit summary

17:3717:37, 11 May 2012 diff hist +53 MATHCOUNTS No edit summary
17:3617:36, 11 May 2012 diff hist +22 MATHCOUNTS →Past State Team Winners
17:3617:36, 11 May 2012 diff hist +27 MATHCOUNTS →Past Winners

19:2619:26, 3 April 2012 diff hist +2,271 2012 AIME II Problems/Problem 9 →Solution

15:1315:13, 31 March 2012 diff hist +637 N 2012 AIME II Problems/Problem 15 Created page with "== Problem 15 == Triangle <math>ABC</math> is inscribed in circle <math>\omega</math> with <math>AB=5</math>, <math>BC=7</math>, and <math>AC=3</math>. The bisector of angle <mat..."
15:1215:12, 31 March 2012 diff hist +430 N 2012 AIME II Problems/Problem 14 Created page with "== Problem 14 == In a group of nine people each person shakes hands with exactly two of the other people from the group. Let <math>N</math> be the number of ways this handshaking..."
15:1115:11, 31 March 2012 diff hist +351 N 2012 AIME II Problems/Problem 13 Created page with "== Problem 13 == Equilateral <math>\triangle ABC</math> has side length <math>\sqrt{111}</math>. There are four distinct triangles <math>AD_1E_1</math>, <math>AD_1E_2</math>, <ma..."
15:1115:11, 31 March 2012 diff hist +532 N 2012 AIME II Problems/Problem 12 Created page with "== Problem 12 == For a positive integer <math>p</math>, define the positive integer <math>n</math> to be <math>p</math>''-safe'' if <math>n</math> differs in absolute value by mo..."
15:1015:10, 31 March 2012 diff hist +371 N 2012 AIME II Problems/Problem 11 Created page with "== Problem 11 == Let <math>f_1(x) = \frac23 - \frac3{3x+1}</math>, and for <math>n \ge 2</math>, define <math>f_n(x) = f_1(f_{n-1}(x))</math>. The value of <math>x</math> that sa..."
15:0915:09, 31 March 2012 diff hist +302 N 2012 AIME II Problems/Problem 10 Created page with "== Problem 10 == Find the number of positive integers <math>n</math> less than <math>1000</math> for which there exists a positive real number <math>x</math> such that <math>n=x\..."
15:0915:09, 31 March 2012 diff hist +399 N 2012 AIME II Problems/Problem 9 Created page with "== Problem 9 == Let <math>x</math> and <math>y</math> be real numbers such that <math>\frac{\sin x}{\sin y} = 3</math> and <math>\frac{\cos x}{\cos y} = \frac12</math>. The value..."
15:0815:08, 31 March 2012 diff hist +222 N 2012 AIME II Problems/Problem 8 Created page with "== Problem 8 == The complex numbers <math>z</math> and <math>w</math> satisfy the system <cmath> z + \frac{20i}w = 5+i \\ \\ w+\frac{12i}z = -4+10i </cmath> Find the smallest pos..."
15:0715:07, 31 March 2012 diff hist +274 N 2012 AIME II Problems/Problem 7 Created page with "== Problem 7 == Let <math>S</math> be the increasing sequence of positive integers whose binary representation has exactly <math>8</math> ones. Let <math>N</math> be the 1000th n..."
15:0715:07, 31 March 2012 diff hist +127 2012 AIME II Problems/Problem 6 No edit summary
15:0515:05, 31 March 2012 diff hist +966 N 2012 AIME II Problems/Problem 5 Created page with "== Problem 5 == In the accompanying figure, the outer square <math>S</math> has side length <math>40</math>. A second square <math>S'</math> of side length <math>15</math> is con..."
15:0415:04, 31 March 2012 diff hist +1,009 N 2012 AIME II Problems/Problem 4 Created page with "== Problem 4 == Ana, Bob, and Cao bike at constant rates of <math>8.6</math> meters per second, <math>6.2</math> meters per second, and <math>5</math> meters per second, respecti..."
15:0315:03, 31 March 2012 diff hist +453 N 2012 AIME II Problems/Problem 3 Created page with "== Problem 3 == At a certain university, the division of mathematical sciences consists of the departments of mathematics, statistics, and computer science. There are two male an..."
15:0215:02, 31 March 2012 diff hist +245 N 2012 AIME II Problems/Problem 2 Created page with "== Problem 2 == Two geometric sequences <math>a_1, a_2, a_3, \ldots</math> and <math>b_1, b_2, b_3, \ldots</math> have the same common ratio, with <math>a_1 = 27</math>, <math>b_..."
15:0015:00, 31 March 2012 diff hist +145 N 2012 AIME II Problems/Problem 1 Created page with "== Problem 1 == Find the number of ordered pairs of positive integer solutions <math>(m, n)</math> to the equation <math>20m + 12n = 2012</math>."