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- Permutations, Combinations, Arrangements, and Strings [10/22/2007]
When a coin is tossed four times, is an outcome of HTTH considered a
permutation, a combination, or something else entirely?
- pH Definition [10/20/2001]
What is the 'p' in pH?
- Phi [05/18/1997]
What is phi?
- Pick's Theorem, Lattice Points, and Area [08/27/1998]
What is a lattice point, and how does it relate to the area of a
triangle, rectangle, and a circle?
- Point Symmetry [08/19/2001]
What exactly is point symmetry? How can one tell if point symmetry is
- Polyhedra: Classification, Theorem [02/12/1998]
I would like to know how polyhedrons are classified, which figures can be
used for the faces, and the theorem relating the faces, edges, and
- Polyhedra: Solids or Surfaces? [06/06/2003]
Is a polyhedron always a solid figure?
- Polynomial Basics and Terms [05/20/1998]
I'm having a lot of trouble understanding polynomials.
- Polynomial Degrees and Definition of a Field [03/02/1998]
The degree of polynomials added together, and definition of a field.
- Polyominoes [09/08/1997]
I am using polyominos, but I do not know how to tell my dad what they
are. How can I tell him so he will know?
- Power or Exponent? [10/14/2003]
I always thought that 'power' was just a synonym for 'exponent'. Is
- Principal Square Root Positive [10/24/2002]
Why are we always taught that the principal square root of a number is
- Product Notation [10/26/2000]
Can the pi symbol also be used to mean multiplying all the terms in a
- Profit Margin and Percentage Markup [02/16/2007]
I own a small business and am a little confused about the difference
between a percentage markup and a profit margin. Are they the same
thing? If not, how are they different?
- Pronumerals [05/14/2002]
What is a 'pronumeral'?
- Proofs with Isosceles Triangles [10/28/1998]
What are altitudes, angle bisectors, and medians? How do you prove that
in an isoseles triangle, the altitude is a median and an angle bisector?
- Proportionality Symbol [05/20/2003]
Do you know the name of the little symbol used in the topic of rates
and variation that means 'in proportion to'?
- Pyramids and Triangular Prisms [05/09/2000]
What's the difference between a pyramid and a triangular prism?
- Quadrant [03/25/2001]
What is a quadrant?
- Quadratic Equation [7/10/1996]
Why is a quadratic equation "quadratic"?
- Quadratic Equations [12/3/1995]
My students want to know why an equation of the second degree is referred
to as a quadratic equation. What does the prefix quad have to do with
second degree equations?
- Quadrilateral Classification: Definition of a Trapezoid [01/15/1997]
What is the correct definition of a trapezoid, and why?
- Quadrinomials [02/26/2001]
What is a quadrinomial, and how is it used?
- Raised Cosines [01/28/2001]
What are raised cosines, and how do they work?
- Range - Difference or Difference + 1? [08/05/2003]
Is range the same as 'difference' or not?
- Range, Mean, Median, and Mode [11/17/1998]
Why do we study range, mean, median, and mode? How will these concepts
help me in real life?
- Rate of Change of Distance [05/02/2002]
Speed is defined as the rate of change of distance moved with time.
What is meant by 'rate of change of distance'?
- Recognizing a Function From a Graph [09/03/2003]
How do you know whether a graph represents a function?
- Rectangular Hyperbola [06/11/2002]
The graph of a rectangular hyperbola looks nothing like a rectangle.
Where does the name come from?
- Reflex Angle [11/30/1998]
What is a reflex angle?
- Regression Method [11/18/1997]
What is the regression method?
- Regular vs. Equilateral Polygons [07/24/2003]
What is the difference between a regular polygon and an equilateral
- Relative and Absolute Extrema of a Function [01/07/2004]
What is the difference between the absolute extrema and the relative
extrema in calculus?
- Relatively Prime [10/07/1999]
What does the term relatively prime mean, and how can you determine if
two numbers are relative primes?
- Rhombus and Square Comparison [01/14/2004]
Comparison of the definitions of rhombus and square as a way to answer
the questions, 'Is a square a rhombus?' and 'Is a rhombus a square?'.
- Rhombus vs. Rhomboid [08/27/2002]
What is the difference between a rhombus and a rhomboid?
- Roughing It More Rigorously [12/02/2010]
A physics student wants to make sense of the various symbols used to represent "approximately equal to" -- as well as the phrase's mathematical meaning. Doctor Vogler produces two precise definitions while acknowledging that context, and personal preference, rule the day.
- Scientific Notation and Engineering Notation [10/22/2003]
What is the difference between Scientific Notation and Engineering
- The Second Octant [04/03/2002]
Where is the second octant? No one seems to know how to count the next
octants after the first.
- Set, Subset, Element [3/10/1997]
Please define: set, subset, member, element, intersection, union.