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Three dice |
2004-05-10 |
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From A student:
If one has 3, 6 sided dice what is the probability of the numbers that are rolled to total 4 through 10 inclusively?
Subsequent to this, what is the probability to do this consecutively...say 3 times?
Answered by Peny Nom. |
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Pi |
2004-05-10 |
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From Kim:
I'm a 7th grader at Lakeside Middle School. And I was wondering if you can answer a question for me for my math project. I'm doing a project on pi, and my teacher said to ask an expert like you to ask about how you would use the subject, pi, in real life usage. How would you use pi in real life usage?
Answered by Penny Nom. |
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Why the word combinations? |
2004-05-05 |
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From Megan:
Why are locker combinations called locker combinations not locker permutations. The order of the numbers matter so why aren't they called locker permutations.
Answered by Claude Tardif and Penny Nom. |
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Chi-Squared |
2004-05-05 |
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From Gillian:
OF75 PEOPLE, 43 ARE EXPOSED TO A VIRUS AND BECOME ILL. 11 PEOPLE ARE EXPOSED AND DO NOT BECOME ILL. 3 PEOPLE ARE NOT EXPOSED AND BECOME ILL. 18 PEOPLE ARE NOT EXPOSED AND DO NOT BECOME ILL. THE ATTACK RATE IS 80% FOR THOSE EXPOSED AND 14% FOR THOSE NOT EXPOSED. THE RELATIVE RISK IS 5.7. CAN YOU EXPLAIN TO ME HOW TO CALCULATE A CHI SQUARE TEST FROM THIS.
Answered by Penny Nom. |
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3x squared - 27 / x + 3 |
2004-05-04 |
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From Stef:
3x squared - 27 / x + 3
Answered by Penny Nom. |
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A 3 digit number divisible by 7 |
2004-05-03 |
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From A student:
We need to arrange 1,3 and 6 to form a 3 digit number that is divisible by 7.
Answered by Penny Nom. |
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Solving inequalities |
2004-05-03 |
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From Joe:
Let x be a real number find and graph the solution to the following sentances:
2x-10+9
4X+2<15
5X+3>(x-1)
Answered by Peny Nom. |
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A clock chimes 7 times in 7seconds |
2004-05-02 |
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From Anna:
A clock chimes 7 times in 7seconds. how long does it take the clock to chime 10 times?
Answered by Penny Nom. |
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The equation of a line |
2004-04-30 |
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From Amy:
Write the equation of the line that contains the point (-4,6) and is perpendicular to the line y=5x+100.
Answered by Penny Nom. |
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Setting up an equation |
2004-04-30 |
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From Matt:
I am trying to determine the dimensions of a 22 megapixel digital camera chip that has a 3:2 ratio. We know then, that: 3x = 2y (or 1.5x = y)
and that
xy = 22
Beyond this, I don't know how to hook those 2 seemingly unrelated facts together.
Answered by Penny Nom. |
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The sum of 4,0,-4..., -156 |
2004-04-28 |
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From Christina:
find the requested sum of the arithmetic sequence
4,0,-4..., -156
Answered by Penny Nom. |
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Yards in a concrete driveway |
2004-04-27 |
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From Bobbi:
I am wondering how many yards of cement I need for a 49 by 45 area, 5 inches thick. I am a stay at home mom who is not very good at math and I want to pave my drive way. Also what would the yardage be for a 6 inch thick drive way with the same area.
Answered by Penny Nom. |
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Factoring |
2004-04-27 |
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From Bipin:
FACTORISE:
a to the power of 6 + b to the power of 6
Answered by Penny Nom. |
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An oil-drilling platform |
2004-04-27 |
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From Alie:
An oil-drilling platform is located in the Gulf of Mexico 3.25 miles from the nearest point on shore. From a point B on the shore due east of A the bearing of the platform is S51.2W. How far is it from B to the platform?
Answered by Penny Nom. |
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The height of a triangle |
2004-04-27 |
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From Danielle:
what is the definition of height of a triangle?
Answered by Penny Nom. |
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