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The normal distribution. |
1997-03-21 |
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Donna D.Hall pose la question : I am looking for a proof for the normal distribution. I suppose "proof" was not a good choice of words. What I am looking for is a way to "derive" the normal distribution in simple terms so that the most average teenager can see the logic. Can you help me? Harley Weston lui répond. |
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Why QUADratic? |
1997-03-19 |
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Paula Miller pose la question : A student today asked me why a quadratic, with highest power of degree 2, was called a QUADratic. We're awaiting the answer with baited breath! :) Chris Fisher and Walter Whiteley lui répond. |
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Mathematical Induction and the Derivative |
1997-03-18 |
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Shuling Chong pose la question : "Obtain a formula for the nth derivative of the product of two functions, and prove the formula by induction on n." Any educated tries are appreciated. Penny Nom lui répond. |
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A Presidential Proof |
1997-03-18 |
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Greg Smith pose la question : Which US president developed a proof for the Pythagorean Theorem? Where can a copy of the proof be located? Chris Fisher and Harley Weston lui répond. |
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The Real Pythagoras |
1997-03-16 |
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Michael Gaskin pose la question : I am wondering if you have any information about Pythagoras and his accounts in math. Chris Fisher lui répond. |
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Ajax, Beverley, Canton and Dilltown |
1997-03-14 |
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S. Johnson pose la question : The following towns are placed on a coordinate system. Ajax at (-x,z), Dilltown at (-10,0), Canton at (0,0) and Beverly at (0,10). The roads from Beverly to Canton and from Canton to Dilltown are perpendiculat to each other and are each 10 miles in length. A car traveling at all times at a constant rate, would take 30 minutes to travel straight from Ajax to Canton, 35 minutes to travel from Ajax to Canton via Beverly, and 40 minutes to travel from Ajax to Canton via Dilltown. What is the constant rate of the car, to the nearest tenth of a mile per hour. Chris Fisher and Harley Weston lui répond. |
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Names of the Polygons |
1997-03-04 |
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Manuel pose la question : What do you call a 13 sided polygon? Is there a list of the different names? Walter Whiteley and Harley Weston lui répond. |
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0! |
1997-03-02 |
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Donna D. Hall pose la question : I am looking for a quick and easy explanation as to why 0! is 1. Walter Whiteley and Denis Hanson lui répond. |
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Area Between Two Sectors |
1997-03-02 |
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Rebecca Henry pose la question : Points A,B,C,D,E,F are equally spaced on a unit circle. Arc CGE has a center A. Find the number of square units of area in the shaded region. Walter Whiteley lui répond. |
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A Functional Equation. |
1997-02-26 |
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Ronald Lui pose la question : Find all functions f:S --> S statisfying the two conditions: 1)f(x+f(y)+xf(y))=y+f(x)+yf(x) for all x and y in S 2)f(x)/x is strictly increasing on each of the interval -1 Saroop Kaul and Chris Fisher lui répond. |
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Equivalent Expressions |
1997-02-26 |
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Karyn Jones pose la question : Josie says that s=n/(n+1) and s/(1-s)=n are two ways to write the same formula. Describe whether or not you agree with Joise. Explain how you made your decision. Walter Whiteley and Penny Nom lui répond. |
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Some Circle Questions. |
1997-02-25 |
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Staci Vawser pose la question : A circle with a radius of 10m is drawn. A chord is drawn across the circle. How is the area that is formed between the chord and the arc calculated? Harley Weston lui répond. |
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Triangles, The Pythagorean Theorem and Pizzas. |
1997-02-23 |
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Sherryle Mathis pose la question : I am a graduating senior presently teaching geometry as part of my student teaching. I will do my CUP on Right Triangles and Pythagorean theorem. I am looking for a fun activity as part of my unit plan. Walter Whiteley lui répond. |
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Division by zero |
1997-02-14 |
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Linda Hood pose la question : I am a college student and have been asked to explain and figure out why we can't divide by zero. Chris Fisher lui répond. |
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When is ( n^3+1)/(mn-1) an integer? |
1997-02-11 |
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Ronald Lui pose la question : Determine all ordered pairs (m,n) of positive integers such that ( n^3+1)/(mn-1)is an integer. Richard McIntosh lui répond. |
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