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Your DJ Business |
2001-05-30 |
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From Linda:
Your DJ Business has 6 rap, 10 rock, 6 alternative, 8 oldies, and 5 country CD singles. How many different 10-song sets can the DJ play, if she plays 2 singles from each category? and How many different 10-song sets if she plays exactly 3 rap singles and 4 rock singles in each set?
Answered by Leeanne Boehm. |
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Jim's poker game |
2001-05-24 |
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From Nick and Karnal:
One day jim played poker with some of his friends and lost half his money.the number of dollars he had before the game was the same as the number of cents he had after the game, and the no of cents he had before the game was twice as much as the number of dollars he had after the game.how much money did he have before thegame???
Later that day jim met a friend Al on the street."hi al!Do u have any change on you al?""yes"
"Good!can u give me a change of a dollar?" "I am afraid not!"
"Then give me change of 50 cents.""I am sorry i cant."
"how about a change of a quarter?""not possible."
"a dime."
"also not"
"a nickel?"
"not even that."
al had no bills or silver dollars on him.whats the largest amount of cash he could have had? hope u can help me.
Answered by Penny Nom. |
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Pi |
2001-05-24 |
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From Mary:
Where does the term pi come from and how many digits are actually in pi?
Answered by Penny Nom. |
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New Quebec reform |
2001-05-24 |
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From Marie-Andrée:
I am a middle school teacher beginning to adapt to the new Quebec reform. I am regularely doing projects in écologie and géographie in French immersion based on the international schools way of thinking (What form does it have? How does it work? What is its history? How does it change? How is it linking to our lives? What is our responsibility about that fact or that thing?) and I have real difficulty to make it work for math. So now, I am looking for math concepts (8) which would link to the same way of thinking. What are your suggestions?
Answered by Claude Tardif. |
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SPRT |
2001-05-24 |
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From A researcher:
I have a medical-pharmaceutical study that says: SPRT (something to do with Secuential and Truncated). Do You know what it means S.P.R.T. and what it is?
Answered by Ejaz Ahmed and Penny Nom. |
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The diameter of an oval |
2001-05-23 |
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From Tim:
Is there a such thing as a diameter of a oval? If not, is there a way to get the circumference?
Answered by Claude Tardif and Penny Nom. |
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Harmonic numbers |
2001-05-23 |
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From Leslie:
The harmonic numbers Hk, k = 1,2,3.....are defined by Hk = 1 + 1/2 + 1/3....1/k I am trying to prove by mathematical induction: H2n >= 1 + n/2 , whenever n is a nonnegative integer. H8 = H23 >= 1 + 3/2 Can you help?
Answered by Harley Weston. |
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How many sides does a circle have? |
2001-05-16 |
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From Georganne:
How many sides does a circle have?
My son answered "infinate" on a test and was corrected. The school insists the answer is 0.
Answered by Chris Fisher and Denis Hanson. |
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A 6 character field |
2001-05-16 |
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From A parent:
I have a 6 character field that can use any combination of alpha-numeric characters (A-Z, 0-9). How many total combinations are possible?
Answered by Penny Nom. |
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Quadratics |
2001-05-16 |
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From John:
I am in the final stages of a math project and I need to interview an expert for the last part. Please try to answer at least a few of these questions. - How do you use quadratic equations in your everyday life?
- Do you find being a math expert very helpful in life?
- Is the quadratic equation useful to you?
- Why did you decide to become a math expert?
- What do you think is the most important function of the quadratic equation?
Answered by Harley Weston. |
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25 y^2 + 20 y z - 4 z^2 |
2001-05-15 |
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From Kimmy:
i don't know how to factor the trinomial 25y2 + 20yz - 4z2. I can get it, but i get messed up on getting the minus 4 at the end. all i get is a plus 4. Can it even be factored.
Answered by Penny Nom. |
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A pile of sand |
2001-05-14 |
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From Gul:
- Sand for use on icy roads is stored in a conical pile 14.2 m high and with a base diameter of 34.4 m
- calculate the volume of the pile
- if one sander can take 6.9 m of sand, how many sanders can be filled from the pile?
Answered by Penny Nom. |
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A triangular pyramid |
2001-05-14 |
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From Kumar:
In a Pyramid OABC, all the three sides of the base: a, b, c are known. Also known are the angles between the three sides from the vertex O: Angles AOB, BOC, COA. With this information, is it possible to calculate the lengths of the three sides: OA, OB & OC.
Answered by Chris Fisher. |
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Manifolds |
2001-05-14 |
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From Thierry:
Maybe you could help me, because I have serious problems for the translations of an English mathematic word which is "MANIFOLD". It's impossible to have a clear translation in French. Do you have a solution?
Answered by Claude Tardif. |
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Toy bricks |
2001-05-13 |
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From Sarah:
A regular-sized brick weighs 4 kilograms. How much will a similar toy brick, made of the same material, but all of the same dimensions of which are four times smaller, weigh? The 300-metre tall Eiffel tower is made of steel and weighs 8 000 000 kg. An exact replica, made of the same material, weighs 1 kg. How high is the replica
Answered by Penny Nom. |
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