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x^x^x^x^... |
2004-01-23 |
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Ryan pose la question :
you have a number say x and it is to the power of x which is to the power of x and so on infinite times like x^x^x^x^x^x^x^... i have to figure out what x is so that the answer is always 2
Penny Nom lui répond. |
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A counterfeit coin |
2004-01-23 |
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Kim pose la question :
You are considering buying 45 silver coins that look alike, but you have been told that one of the coins is a lightweight counterfeit. Find the least number of weighings on a balance scale that you can use to be certain you have found the counterfeit coin?
Penny Nom lui répond. |
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g on Mars |
2004-01-22 |
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RC pose la question :
To measure the acceleration on Mars an object is dropped from a height of 160m. It takes 10s for this object to hit the ground. What is the value for g on Mars?g
Penny Nom lui répond. |
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A game with some strings |
2004-01-22 |
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Trudy pose la question :
A boy holds 6 pieces of strings in his hands with the ends protruding above and below. The top ends are tied together in pairs and then the lower ends are tied together in pairs. What is the probabilty that the pieces of string are all joined in one loop?
What is the probability of obtaining two loops?
Can you generalise this to solve the problem for 2n blades of grass?
Andrei Volodin and Penny Nom lui répond. |
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BEDMAS |
2004-01-21 |
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Jessica and her mom pose la question :
my mom and I were wondering 2 things.
1. what is the reason for having bedmas.
2. 5+5-4+[6x3-(6+1-3x2) -5+9]
Penny Nom lui répond. |
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A problem with sets |
2004-01-20 |
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Jason pose la question :
Given that the universal set S is the set of all sports fans, and
F={x|x is a football fan}
B={x|x is a basketball fan}
H={x|x is a hockey fan}
a)Describe (F^B)' (f intersect b)' in words
b)Draw a Venn Diagram and shade the region that represents the set of football fans or both basketball and hockey fans.
Penny Nom lui répond. |
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What is the speed of the automobile? |
2004-01-20 |
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Rita pose la question :
An automobile travels toward Nashville from Cookeville. It takes 33 minutes to travel from Cookeville to Manchester, which is a 36 mile distance. If the driver continues at this pace, what is the speed of the automobile?
Penny Nom lui répond. |
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A parabolic arch |
2004-01-19 |
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Teresa and Robyn pose la question :
A bridge over a river is supported by a parabolic arch...arch is 200 m wide at water level...the maximum height of the arch is 80 m..what is the height of the arch measured from a point on the water 40m from the centre of the arch
Penny Nom lui répond. |
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The product of any n consecutive integers |
2004-01-18 |
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Fazia pose la question :
I have to prove that the product of any n consecutive integers is divisible by n!(eg:the product of five consecutive integers is divisible by 5!) It's easy enough to plug in numbers and prove it is true, but i'm finding it difficult to come up with a proper proof.
Claude Tardif lui répond. |
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Combinations of 12 numbers |
2004-01-18 |
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Cheryl pose la question :
I would like to know the total possible combinations using the numbers 1-12. We would also like to know the formula used to calculate the number of combinations.
Harley Weston lui répond. |
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Cubic yards in a concrete wall |
2004-01-18 |
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Danny pose la question :
I am studing for my contractors exam. I am haveing truble with a few questions. I have the answer to the problems but I dont know how to get them my self.
please help
How many cu. Yds. Of concrete are in a wall that is 150' long and 8'4" high an d 8' thick
Penny Nom lui répond. |
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Some trig problems |
2004-01-18 |
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Weisu pose la question :
I have some questions about pre-calculus.
(1) (2(cos(x))^2)+3sin(x)-1=0
(2) sin(x)cos(x)=(1/2)
(3) 3sin(x)=1+cos(2x)
(4) tan(x)*csc(x)=csc(x)+1
(5) sin(arccsc(8/5))
(6) tan(arcsin(24/25))
(7) arccos(cos(11pi/6))
the last problem uses radian measure.
Penny Nom lui répond. |
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Two consecutive negative integers |
2004-01-17 |
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Amanda pose la question :
Find two consecutive negative intergers whose product is 182.
Penny Nom lui répond. |
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Six letter words |
2004-01-17 |
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Debora pose la question :
An anthropologist discovers an isolated tribe whose written alphabet contains only six letters (call the letters A, B, C, D, E, and F). The tribe has a taboo against using the same letter twice in the same word. It's never done. If each different sequence of letters constitutes a different work in the language, what is the maximum number of six- letter words that the language can employ?
Penny Nom lui répond. |
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Arrays of pennies |
2004-01-17 |
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Kathleen pose la question :
How do I create an array of 100 pennies?
Penny Nom lui répond. |
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