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Rolling three dice |
2012-01-26 |
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From Aishwarya:
A red, a blue and a green die are all thrown at the same time. Display all the possible outcomes in a suitable way. Find the probability of obtaining:-
1. A total of 18 on the three dice
2. a total of 4 on the three dice
3. a total of 10 on the three dice
4. a total of 15 on the three dice
5. a total of 7 on the three dice
6. the same number on each die..
Answered by Robert Dawson. |
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The difference in the latitudes of Lynchburg and Myrtle Beach |
2012-01-26 |
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From Sarah:
Assuming that the earth is a sphere of radius 6378 kilometers, what it is the difference in the latitudes of Lynchburg, Virginia and Myrtle Beach, South Carolina, where Lynchburg is 400 kilometers due north of Myrtle Beach?
Answered by Robert Dawson. |
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A circular cylinder circumscribed about a right prism |
2012-01-25 |
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From Noriz:
A cylinder is circumscribed about a right prism of altitude 12.6cm.
Find the volume of the cylinder if the base of the prism is an
isosceles triangle of sides 3cm by 3cm by 2cm.
Hope you can help me with this.
Answered by Penny Nom. |
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Great circle course |
2012-01-25 |
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From Hervé:
On the earth, the mathematical formula giving the distance
between two points, and the initial course for a boat on the great circle
is well known.
I need to find the inverse formula, ie knowing an initial position on earth,
and the initial course of the boat, and the distance to run on the great circle,
the formula gives the final position (longitude and latitude).
Answered by Robert Dawson. |
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Today is Emma's Birthday. |
2012-01-25 |
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From Mike:
Today is Emma's Birthday.
Emma's mother is four times as old as Emma is today.
In four years, Emma's mother will be three times as old as Emma.
How old is Emma today?
Answered by Penny Nom. |
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A fountain |
2012-01-24 |
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From kris:
A fountain has a radius of 14 meters to its outer edge. Their is an inner ring in the center of the fountain, where a statue of Sir Isaac Newton stands, that does not contain water. The inner ring has a diameter that is 6m less than the diameter of the outer ring of the fountain. What is the circumference of the inner ring? What is the area that is covered by water in the fountain?
Answered by Penny Nom. |
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Ten percentage of 24 hours |
2012-01-23 |
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From robin:
Hai.. Myself Robin.. May i know the ten percentage of 24 hours? Pls help me.. Thank you.
Answered by Penny Nom. |
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Four pizzas |
2012-01-23 |
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From kris:
a pizza company wishes to put 4 medium pizzas in a box to sell as a party pack. The box they want to use the square and has dimensions of 60cm by 60cm. They need you to help them calculate the dimensions of the pizza that will fit in the box. Calculate the following: area, radius, diameter, circumference
Answered by Penny Nom. |
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A cube inscribed in a sphere |
2012-01-23 |
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From Gelo:
What are the largest volume and total surface area of a cube that may be inscribed inside a sphere whose radius is 5 kilometers.
Answered by Walter Whiteley. |
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A problem in logic |
2012-01-19 |
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From Ghader:
The puzzle below I know the answer to; because someone told me! My question is: how could I answer it using logic, maths, etc. what field of inquiry does this kind of problem fall into?
Puzzle: You are in a room with two men: one is a compulsive liar and the other is a compulsive honest. There are two doors: one leading to heaven, the other to hell. The two men know which door leads to where. You want to go to heaven but are allowed only ONE question from one or the other of the two men. What would that question be?
[The question to ask, from either man, is: "if I asked the OTHER man which door leads to heaven, which door would he point?". You would then choose the other door.]
Has this answer got any basis in logic or maths at all?
Answered by Robert Dawson. |
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-8(3x+4)+6x=4(x-8 )+4x |
2012-01-18 |
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From bianca:
-8(3x+4)+6x=4(x-8 )+4x
Answered by Penny Nom. |
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A limit |
2012-01-18 |
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From Neil:
The limit of [(1/x)^3 - 1/8]^1/3 all over (x - 1/2) as x approaches 1/2 to positive infinity. How to answer that?
Answered by Harley Weston. |
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The difference in latitudes of two cities |
2012-01-18 |
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From Renee:
Assuming that the earth is a sphere of radius 6378 kilometers, what is the difference in latitudes of two cities, one of which is 600 kilometers due north of the other?
Answered by Robert Dawson. |
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Tangent of theta |
2012-01-17 |
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From stahl:
explain what the 'tangent of theta' means. Draw and label a diagram to help with your explanation.
Answered by Harley Weston. |
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Brian on his bike |
2012-01-16 |
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From tiffany:
Brian rides his bike 0.29 miles per minute. If it takes him 22 minutes to ride his bike to his friend's house, how far away does his friend live?
Answered by Penny Nom. |
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