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math puzzle |
2007-11-29 |
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From Will:
This is a math puzzle called "What's my number"
1. It is a three-digit whole number.
2. It is a square number.
3. It is divisible by 5.
4. it is not an even number.
5.Each of it digit is not different.
6. It is divisible by 9.
7.It is less than 500.
8. Its ones digit is 5.
9.It has only one odd digit.
10. Its tens digit is less than its ones digit.
Answered by Leeanne Boehm. |
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(32-2 x 5) divided by 2 + 8 |
2007-11-28 |
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From Kim:
Solve
(32-2 x 5) divided by 2 + 8
Answered by Leeanne Boehm. |
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An arched entry |
2007-11-28 |
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From amber:
i am working with an arched entry. i know that the radius is 25' and the height is 20'-11". i need to know the length of the arch and degree of bend of the arch. how do i find these?
Answered by Stephen La Rocque. |
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Percent change between two value ranges |
2007-11-28 |
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From Joe:
How do you calculate a percent change between tow value ranges - for instance if I project a range for 2007 to be between 100 and 120 and a range for 2008 to be between 120 and 140, how do I calculate the estimated increase between the range? Is it 0% to 40% (taking the two inside values rto calculate the minimum and the two outside values rto calculate the maximum?)
Answered by Harley Weston. |
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A trig identity |
2007-11-28 |
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From Julia:
sin4x 1 - cos2x
------------ x ---------- = tanx
1 - cos4x cos2x
Answered by Harley Weston. |
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A square near 522 |
2007-11-28 |
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From ali:
What a way to know the smallest number could blow number 522 to become fully square
Answered by Penny Nom. |
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Powers of 2 |
2007-11-28 |
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From Kim:
Complete the following:
2 to the power of 4=
2 to the power of 3=
2 to the power of 2=
2 to the power of 1=
If the pattern continues, 2 to the power of 0 =
Answered by Penny Nom. |
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O,T,T,F,F,S,S,?,?,? |
2007-11-28 |
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From Kim:
What are the next 3 letters in this sequence?
O,T,T,F,F,S,S,?,?,?
Answered by Stephen La Rocque. |
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Multiplying an inequality by a negative number |
2007-11-27 |
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From Lisa:
Why is it that you have to switch the sign of the inequality when you divide or multiply by an negative number to solve for a variable?
Answered by Penny Nom and Walter Whiteley. |
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The probability of an odd number |
2007-11-27 |
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From Malonda:
Suppose you select a 3-digit number at random from the set of all positive 3-digit numbers. Find each probability.
P(odd numbers)
Answered by Stephen La Rocque. |
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Addends |
2007-11-27 |
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From jessica:
what is a addends my son needs to write a number sentence that has two addends that are the same
Answered by Stephen La Rocque. |
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A math riddle |
2007-11-27 |
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From Kathleen:
My 4th grade daughter was given a math riddle which she is expected to answer using a problem solving strategy. The question is:
The number of my hundreds and the number of my thousands is 3. The number of my tens is 7 times the number of my thousands. All my digits are different. What am I?
I have tried to come up with an answer, but am beginning to think it is less complicated than what I have come up with.
Answered by Stephen La Rocque. |
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Direct and inverse variations |
2007-11-27 |
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From Julie:
Please Help I do not understand this question. X varies directly as the square of S and inversely as T. How does X change when S is doubled ? When both S and T are doubled ? I appreciate your help with this problem.
Answered by Stephen La Rocque. |
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A=B+C+D+F+G+H+J |
2007-11-27 |
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From Boubendir:
voila ma question et comme savoir les nombres additioné en etulisant le resultat
A=B+C+D+F+G+H+J
au debut ons a les B,C,D,F,G,H,J on connaissent leur valeur comment retrouver
valeur on etulisant leur resultat
Answered by Claude Tardif. |
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How many cubes have one face painted red? |
2007-11-27 |
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From Ashutosh:
A rectangular block measuring 10 units by 8 units by 6 units is made up of cubes measuring 1 unit on a side. The base of the block is 10 units by 8 units. The outside of the block other than the base is painted red. How many of the unit cubes have exactly one face painted red?
Answered by Stephen La Rocque and Penny Nom. |
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