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Volume of a sphere |
2002-08-16 |
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Rahul pose la question :
How do i find the volume of a sphere without the knowledge of calculus?
Walter Whiteley lui répond. |
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Distance in 3-space |
2002-08-16 |
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David pose la question :
The question is: how do I figure out the distance of one object in 3D space to another object in 3D space? I have an object at say x = 5.872, y = 2.876, and z = 7.290; and the other object is at x = 1.129, y = -8.213, and z = -11.127. I have been suggested to use the pythagorean theory on this, but since there are three variables, I don't understand how.
Penny Nom lui répond. |
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Probability |
2002-08-16 |
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Chris pose la question :
There are two possible outcomes for a random event, A and B. The probability of A being the outcome is 63%, and B 37%. What is the likelihood that B will be chosen twice, consecutively? Three times, ten?
Andrei Volodin lui répond. |
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Variable expressions |
2002-08-15 |
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Brittany pose la question :
I am just learning variable expressions. My homework is to write a variable expression for each word phrase;
example :
the number of minutes in s seconds
the cost of x cartons of juice at $.75 each
And etc.
I don't understand it
Penny Nom lui répond. |
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A paper model of a cone |
2002-08-14 |
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Bruce pose la question :
I have made a paper model of a cone, cut a sloping section, and removed the top. I have drawn the major and minor axis on the paper surface of the section. The major axis is not symmetrical about the minor axis. To me, this is not an ellipse. To me, an ellipse is a tubular section, because this gives a symmetrical major axis. What is your opinion?
Walter Whiteley and Chris Fisher lui répond. |
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The circumference of a 72 |
2002-08-14 |
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Linda pose la question :
What is the circumference of a 72" diameter circle?
Penny Nom lui répond. |
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Two equations |
2002-07-26 |
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Derek pose la question :
1. 3x + 2y = 4
2. -7x + 2y = 24 finding x and y.
Penny Nom lui répond. |
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Some inequalities |
2002-07-25 |
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A student pose la question :
1)-5 <= -3X+1 < 1 2)4X-2 < 6 OR X+2 > 9
Penny Nom lui répond. |
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Musical Scales |
2002-07-24 |
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Terence pose la question :
Given that there are 12 notes in a musical octave, what is the maximum number of musical scales possible within that octave, if each scale has a minimum of 5 notes and a maximum of 9 and we start all the scales from the same note? In case you don't know anything about music, a scale is a progression of notes where you start on a specific note and end on that same note an octave higher. There are twelve different notes between these two similar notes. Which notes you choose to play determine the sound of the scale. Anything less than five notes would not make for a very interesting scale. Anything more than nine and you would be playing almost 'every' note in the scale, not leaving much room for distinction in how you organize these notes. I assume you first have to figure out the maximum number of variations possible in a 5-note scale (with 12 notes at your disposal). Then do the same for a 6-note scale, then a 7-note, then an 8-note, and so on. Then add up the results. How to find this maximum number of variations for each scale size though is what I don't know.
Leeanne Boehm lui répond. |
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20 men dig 40 holes in 60 days |
2002-07-24 |
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Lindsey pose la question :
20 men dig 40 holes in 60 days. So, 10 men can dig 10 holes in how many days?
Penny Nom lui répond. |
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x + 5 + x, if x = 4 |
2002-07-23 |
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Elisa pose la question :
x + 5 + x, if x = 4
Leeanne Boehm lui répond. |
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7th grade math lesson plans |
2002-07-23 |
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Peter pose la question :
Where can I get samples of 7th grade math lesson plans and curriculum for the whole year?
Leeanne Boehm lui répond. |
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As much greater than 47 as it is less than 105 |
2002-07-23 |
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Joe pose la question :
To find the number in question you need to find the number exactly half-way between 47 and 105. Another way of thinking about the number that is half-way between two other numbers is as the average of the two numbers given.
Leenaan Boehm lui répond. |
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Domain of a function |
2002-07-20 |
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Andy pose la question :
I'm having difficulty in finding the domain of 1/(x2 -2x + 4) one over x squared minus 2 x plus 4.
Penny Nom lui répond. |
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Percentage |
2002-07-20 |
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Sally pose la question :
If 20% of 100 is 80, then why is the percentage difference between 80 and 100 25%.
Penny Nom lui répond. |
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