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2^(2^1954) est-il premier? |
2005-10-04 |
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From Un eleve:
2(21945)+1 est-il premier?
Answered by Claude Tardif. |
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A combination lock |
2005-10-03 |
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From A bicycle owner:
What are the number of permutations (Combinations?) of a combination lock of a cylinder with four separate movable rings. Each ring has the numbers from one to six (six "permutations" per ring).
This is a bicycle lock.
I was told that it is 62 (6x6x6x6) = 1296.
Is this correct?.
Answered by Penny Nom. |
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3z-5+2z=25-5z |
2005-10-02 |
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From Davis:
3z-5+2z=25-5z
Answered by Penny Nom. |
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Prove that a rhombus' diagonals are perpendicular |
2005-10-02 |
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From Tania:
How do you prove that a rhombus' diagonals are perpendicular using the 2 column proof method?
Answered by Walter Whiteley. |
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Inches and millimeters |
2005-09-30 |
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From A student:
how many inches are there in mm? For example 30x40 mm = how many inches.
Answered by Penny Nom. |
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6 trillion x 50 million |
2005-09-30 |
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From Roly:
There is a realm of the richest galaxies in the in the night sky. They are 50 million light years away. That is 6 trillion x 50 million???. What math equivalent is that?
Answered by Penny. |
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Two groups that have equal sums |
2005-09-30 |
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From Anita:
using the numbers 1, 2, 3, 4, 5, 6, 7,and 8. how do we divide them into two groups so that they have equal sums?
Answered by Penny. |
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Partages inégaux |
2005-09-29 |
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From Un eleve:
Alex et julie ont ensemble 4728 .- euro Si Alex donne 538.- euro à Julie, ce dernier aurait alors le triple de Julie. Quelle est la somme possédée de chacun?
Answered by Claude Tardif. |
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Calculer la clé |
2005-09-29 |
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From Un eleve:
Chaque individu a un numéro INSEE de 13 chiffres auquels est adjointe une clé de deux chiffres.
voici comment est calculée cette clé :
Answered by Claude Tardif. |
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Calcul dun profil fictif |
2005-09-29 |
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From Mr madry loïc:
je suis actuellement en formation pour devenir dessinateur projeteur en BTP ; je rencontre un problème vis à vis d'une égalité qui normalement devrait mettre acquise ( elle doit être issue de thalès ou de l'égalité des proportion ?) cependant, je n'arrive pas trouver le fondement de cette égalité. pourriez vous m'aider à éclaircir cette relation fondamentale afin de poursuivre mon étude sur le calcul de profil en travers (pour les travaux publics) .
Answered by Claude Tardif. |
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Open dots and closed dots |
2005-09-29 |
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From Cynthia:
When graphing the solutions of an inequality, what is the difference between an open dot and a closed dot?
Answered by Penny. |
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exercice! |
2005-09-28 |
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From Un eleve:
soit x et y deux nomres réels telque:
1 ≤ x2-x*y+y2 ≤ 2
1) Montrer que: 2/9 ≤ x4+y4 ≤ 8
2) Montrer que: x2*n+y2*n ≥ 2/32*n telque n est un nombre entier naturel et n≥3.
Answered by Chris Fisher. |
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The length of a circle's chord |
2005-09-28 |
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From A homebuilder:
find the length of a circle's chord with a known arc length and radius/diameter lengths.
Answered by Penny Nom. |
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A multiple-choice and true-false exam |
2005-09-28 |
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From Kiat:
Harry, Neville, Ron, Hermione and Malfoy each answered five questions on O.W.L. exam consisting of two multiple-choice questions (A, B or C) and three True-False questions. They answered the questions as follows:
| Student |
Q1 |
Q2 |
Q3 |
Q4 |
Q5 |
| Harry |
A |
A |
T |
T |
T |
| Neville |
B |
B |
T |
F |
T |
| Ron |
A |
B |
T |
T |
F |
| Hermione |
B |
C |
T |
T |
F |
| Malfoy |
C |
A |
F |
T |
T |
If no two students got the same number of correct answers, who got the most correct answers? And what is the correct answer for each question?
Answered by Denis Hanson. |
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How to add three addends |
2005-09-28 |
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From Patricia:
explaination of how to add three addends if you use a double to add or if you use a sum of 10
8+3+2=
6+4+0=
3+3+6=
2+5+4=
Answered by Baul Betts and Penny Nom. |
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