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Does probability apply here? |
2009-01-15 |
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From Paul:
Suppose I have a dice in my hand that I am about to roll. The probability that I roll a six is, all things being equal, 1/6. I accept that.
Suppose now the I roll the dice and immediately cup my hand over the result. What is the probability that I have rolled a six? People seem to want to say it is still 1/6. But it can't be can it!? It is surely either 1 or 0, depending on whether I have in fact rolled a six?
Answered by Robert Dawson. |
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Ordering fractions |
2009-01-14 |
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From Shea:
I am a special education teacher, who is trying to to show my students how to order fractions. I found your response to this questions while looking for information. I need a visual to explain to my students and myself on how and why you multiply the fractions together.
Answered by Harley Weston. |
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Concrete around a pipe |
2009-01-14 |
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From Doug:
How much concrete will i need for a hole that is 20 feet deep 20 inches in
diameter with a 8-inch pipe in it. I need to know how much concrete
on the outside of the 8-inch pipe.
Answered by Penny Nom. |
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The circumference of a table |
2009-01-14 |
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From Maggie:
My dinning room table is 48 inches. I need to know what its Circumference is?
I do not know algebra so a formula will not help me.
Answered by Penny Nom. |
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A applied math trig problem |
2009-01-13 |
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From Simon:
I wish to find all the answers for the following equation over the interval (0,1):
cos^2(pi * n^x) + cos^2(pi * n^(1-x)) - 2 = 0
where n is any integer > 0
Answered by Robert Dawson and Harley Weston. |
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A rectangular prism |
2009-01-13 |
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From nika:
How many bases does a rectangular prism have? What are they?
Answered by Harley Weston. |
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For which integers a, b, c does a - b - c = a - (b - c)? |
2009-01-13 |
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From Johanna:
For which integers a, b, c does a - b - c = a - (b - c)?
Answered by Penny Nom. |
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A maximum area problem |
2009-01-13 |
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From Kylie:
Help me please! I don't know how or where to start and how to finish.
The problem is: A window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 15 ft., find the dimensions that will allow the maximum amount of light to enter.
Answered by Harley Weston. |
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Two methods of payment |
2009-01-13 |
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From adjoa:
owen was offered $225.00per week plus 3%on sales, or 15%of sales with no salary. How much must he sell before the second method of payment gives him the highest pay? Express your answer to the nearest dollar.
Answered by Penny Nom. |
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The volume of a cone |
2009-01-13 |
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From ab:
the area of the base of the cone shown is 314 cm and it's height is 12 cam what is the volume?
Answered by Penny Nom. |
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Lita and Rose start jogging on a 110 m circular track |
2009-01-13 |
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From Narcisa:
Lita and Rose start jogging on a 110 m circular track. They begin at the same point, but jog in opposite directions, lita at 8/3 meters per second and rose at 7/3 m per second. Find the number of times they they will pass each other during the first 15 minutes of jogging?
Answered by Robert Dawson. |
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Two trains |
2009-01-12 |
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From Shanise:
If train A leaves the train station at noon traveling 45mph and train B leaves the train station at 1pm traveling 65mph, what time will the trains meet?
Answered by Robert Dawson. |
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Negative rate of change |
2009-01-12 |
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From hemanshu:
when i have to find rate of change of decrease in any value my ans comes in negative why??????????
Answered by Penny Nom. |
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A four digit passcode |
2009-01-12 |
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From john:
i have a machine at home that has a four digit passcode and the numbers range from 1 to 4 how can i get all the ways those numbers can be used
Answered by Harley Weston. |
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A seven card poker hand |
2009-01-12 |
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From Sean:
from a standard card deck, seven cards are chosen at random.
find the probability that the set chosen contains exactly three of each
of two different face values.
the second part of the problem asks the probability that the card hand contains
exactly three 2's and exactly three 5's.
Answered by Robert Dawson. |
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