### Volume 5, Number 17

 ``` 24 April 2000 Vol. 5, No. 17 THE MATH FORUM INTERNET NEWS Census 2000 | Algebra: Help - Mishanski / Modules - Stapel Exploratorium's Science of Baseball CENSUS 2000: THE POLITICS BEHIND THE NUMBERS http://www.policy.com/issuewk/1999/0712_82/ The decennial census in the United States determines the number of delegates each state can send to the House of Representatives, provides policy-makers with information necessary to allocate federal and state funding, and gathers needed information for planning schools, hospitals, roads, and police forces. This tour of the controversy over statistical sampling in the census covers topics such as: - A Snapshot of America - The Sampling Debate - in favor of and opposed to sampling - Multiracial Americans and the Census - in favor of and opposed to a multiracial box The site draws extensively on policy statements and position papers by government bureaus, elected officials, non-governmental organizations (NGOs), and citizen action groups. With links to other population and census resources on the Web, and an interactive bulletin board. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- ALGEBRA HELP - Mishanski http://www.algebrahelp.com/ A comprehensive online source for help with algebra, offering the latest technology, lessons to teach or refresh old skills, calculators that show how to solve problems step-by-step, and interactive worksheets for testing skills. To be notified of updates and additions to the site, sign up for its announcements newsletter. \|/ ALGEBRA MODULES (PURPLEMATH) - Stapel http://www.purplemath.com/modules/modules.htm Purplemath's algebra modules give practical tips, hints, and examples, and point out common mistakes. They are cross-referenced, and some contain short quizzes. Contents include: - Basic Triangle Values - Radicals (square roots) - Calculators - Scientific Notation - Canceling Units - Slope and Graphing - Domain and Range - Slope and y-intercept - Exponents - Slope of a straight line - Factoring Quadratics - Solving Inequalities - Function Notation - Straight-line equations - Functions - Translation (word problems) - Graphing "distance" problems - Induction Proofs "investment" problems - Intercepts "mixture" problems - Percent of... "work" problems - Piecewise Functions: - Variables definition of - Vertical Line Test graphing of Homework guidelines list examples, with commentary, of acceptable and unacceptable solutions. Also an online study-skills survey, and links to others' algebra sites. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- EXPLORATORIUM'S SCIENCE OF BASEBALL http://www.exploratorium.edu/baseball/ Interactive (Shockwave) exhibits from San Francisco's science museum include Fastball Reaction Time (can you hit a 90-mph fastball?) and Scientific Slugger (see what makes a home run: vary the angle of the ball, bat speed, and pitch speed, then watch the distance the ball travels). Articles include "Take Me Out to the Besuboru Game," about baseball in Japan; and "Biological Baseball," which offers some facts and reflections on human reflexes, reaction time, and decision-making. Activities include: - Thrown for a Curve (learn how to throw a curveball, screwball, or slider) - Finding the Sweet Spot (of a baseball bat) - Bouncing Balls (how high?) - Handle Forces (get a grip!) - Basketball (about the bounce of the ball) "How Far Can You Hit One?" examines the influence of atmospheric conditions, particularly wind, on fly balls. Read "The Girls of Summer" tour to learn about the first professional female ballplayers. "Putting Something on the Ball" discusses the physics of pitching, especially the phenomenon of transfer of momentum. With a "time machine" on the history of the national pastime, animations, video and audio (RealMedia) clips, and a bibliography. Project participants include Louisville Slugger, the National Baseball Hall of Fame, the Oakland A's, the San Francisco Giants, and Total Baseball. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CHECK OUT OUR WEB SITE: The Math Forum http://mathforum.org/ Ask Dr. Math http://mathforum.org/dr.math/ Problems of the Week http://mathforum.org/pow/ Mathematics Library http://mathforum.org/library/ Teacher2Teacher http://mathforum.org/t2t/ Discussion Groups http://mathforum.org/discussions/ Join the Math Forum http://mathforum.org/join.forum.html Send comments to the Math Forum Internet Newsletter editors _o \o_ __| \ / |__ o _ o/ \o/ __|- __/ \__/o \o | o/ o/__/ /\ /| | \ \ / \ / \ /o\ / \ / \ / | / \ / \ ```