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Volume of a sphere |
2002-08-16 |
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From Rahul:
How do i find the volume of a sphere without the knowledge of calculus?
Answered by Walter Whiteley. |
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Distance in 3-space |
2002-08-16 |
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From David:
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.
Answered by Penny Nom. |
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Probability |
2002-08-16 |
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From Chris:
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?
Answered by Andrei Volodin. |
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Variable expressions |
2002-08-15 |
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From Brittany:
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
Answered by Penny Nom. |
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A paper model of a cone |
2002-08-14 |
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From Bruce:
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?
Answered by Walter Whiteley and Chris Fisher. |
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The circumference of a 72 |
2002-08-14 |
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From Linda:
What is the circumference of a 72" diameter circle?
Answered by Penny Nom. |
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Two equations |
2002-07-26 |
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From Derek:
1. 3x + 2y = 4
2. -7x + 2y = 24 finding x and y.
Answered by Penny Nom. |
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Some inequalities |
2002-07-25 |
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From A student:
1)-5 <= -3X+1 < 1 2)4X-2 < 6 OR X+2 > 9
Answered by Penny Nom. |
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Musical Scales |
2002-07-24 |
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From Terence:
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.
Answered by Leeanne Boehm. |
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20 men dig 40 holes in 60 days |
2002-07-24 |
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From Lindsey:
20 men dig 40 holes in 60 days. So, 10 men can dig 10 holes in how many days?
Answered by Penny Nom. |
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x + 5 + x, if x = 4 |
2002-07-23 |
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From Elisa:
x + 5 + x, if x = 4
Answered by Leeanne Boehm. |
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7th grade math lesson plans |
2002-07-23 |
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From Peter:
Where can I get samples of 7th grade math lesson plans and curriculum for the whole year?
Answered by Leeanne Boehm. |
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As much greater than 47 as it is less than 105 |
2002-07-23 |
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From Joe:
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.
Answered by Leenaan Boehm. |
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Domain of a function |
2002-07-20 |
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From Andy:
I'm having difficulty in finding the domain of 1/(x2 -2x + 4) one over x squared minus 2 x plus 4.
Answered by Penny Nom. |
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Percentage |
2002-07-20 |
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From Sally:
If 20% of 100 is 80, then why is the percentage difference between 80 and 100 25%.
Answered by Penny Nom. |
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