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Why quadratic for a second degree equation? 2001-10-20
Jana pose la question :
Why do we use the word quadratic to describe second degree equations?
Penny Nom lui répond.
A goat in a square pen 2001-10-19
Brad pose la question :
A goat is tied to one corner of a square pen 20 ft. on a side.
  1. If the goat's tether is 10 ft. long, what percentage of the grass in the pen can the goat reach?

  2. What should the length of the tether be so that the goat can reach half of the grass?

Penny Nom lui répond.
Symmetry of f(x) = ax^n 2001-10-18
Mohammed pose la question :
a function of the form f(x)=axn, where a doesn't equal 0 and n is a positive integer is called a power function . how is the exponent in the equation of a power function related to the symmetry of its graph?
Penny Nom lui répond.
414 is what percent of 5,624? 2001-10-18
A student pose la question :
414 is what percent of 5,624?
Penny Nom lui répond.
A function or not a function? 2001-10-18
Christian pose la question :
Which are the following are not functions?
  1. y = x2

  2. y = x3

  3. x = y2

  4. y = 3

Leeanne Boehm lui répond.
Tenths, hundredths, and thousandths 2001-10-17
Cheri pose la question :
I would like the French terms for the decimal place values of tenths, hundredths, and thousandths. (I would be interested in the Spanish terms also if you had them.)
Maria Torres and Claude Tardif lui répond.
Column doesn't add up to 100% 2001-10-17
A student pose la question :
why don't some tables I'm studying in a column add up to 100%? Example: N=338, but responses to questions asked in survey I'm studying equal of 24.3, 9.8, 43.8, DON'T add up to 100%. I'm assuming that some people surveyed out of the 338 didn't bother responding, but is there another problem related to proportion or ratio being used, but improperly labeled on graph?. Note at bottom of table says: "number in parenthesis are numbers of cases" and 338 was in parentheses. I'm lost.
Penny Nom lui répond.
A line in 3 dimensions 2001-10-17
Murray pose la question :
I'm working on a complicated proof and i need the equation for a line in 3 dimensions.
Claude Tardif lui répond.
Dividing a circle 2001-10-17
Ahmeen pose la question :
I am having a hard time figuring out how a circle can be divided into 11 equal parts with only 4 cut allowed? My teacher gave this to us and I still can't cut my pie into eleven equal parts with only four cuts.
Walter Whiteley lui répond.
Dimensions of a frame 2001-10-16
Rachel pose la question :
A rectangular picture frame has a perimiter of 44.2 cm.The width of the frame is seven tenths of its length what are the dimensions of the frame?
Penny Nom lui répond.
Proof by induction 2001-10-16
John pose la question :
Can you help me with any of these?
  1. For any natural number n > 1, prove that

    (4n) / (n + 1) < [(2n)!] / [(n!)2].

  2. For any natural number n > 1, prove that

    1/sqrt(1) + 1/sqrt(2) + 1/sqrt(3) + ... + 1/sqrt(n) > sqrt(n).

  3. For any natural number n and any x > 0, prove that

    xn + xn - 2 + xn - 4 + ... + x-n >= n + 1.

Penny Nom lui répond.
Some algebra 2001-10-15
James pose la question :
I cannot figure these out I was wondering if you could help me? I have no one to answer my questions.
  1. (7x2 – 3yz)2 – (7x2 + 3yz)2

  2. Use Pascal’s triangle to expand (2x – y)4

  3. 8x3 y - x3 y4

  4. (m + 3n)2 – 144

  5. 12x4 y – 16x3 y2 – 60x2 y3

  6. p3 q2 – 9p3 + 27q2 – 243

Peny Nom lui répond.
Squares of one digit numbers 2001-10-15
Needa pose la question :
What two two-digit numbers are each equal to their right-most digit squared?
Penny Nom lui répond.
Rules of exponents 2001-10-14
Carissa pose la question :
how do you work this out? Investigate the relationship between a,b,c and d if 2a*2b=4c/4d?
Leeanne Boehm lui répond.
Absolute Value 2001-10-14
Susan pose la question :
I am a homebound teacher, and my nineth grade algebra I student is having trouble understanding absolute value. Please send me an idea about how to best help her. She may be out of the classroom the entire year.
Chris Fisher lui répond.
 
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