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The extended real number system |
2009-06-30 |
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From Justin:
Hi again, thanks a lot for answering my previous question! I was also just wondering again if the extended real number system has a potential or actual infinity because it includes positive infinity as a point that exists at the end of it?
All the Best,
Justin
Answered by Robert Dawson. |
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The surface area of a fire pit |
2009-06-30 |
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From eric:
whatw is the square footage of the inside wall of a fire pit 2 feet deep and five feet in diameter? I need to estimate both the floor and wall square footage to order bricks.
Answered by Robert Dawson and Harley Weston. |
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A trig identity |
2009-06-30 |
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From sumayya:
prove that sin A (1+tan A)+cos A (1+cot A)= sec A+ cosec A
Answered by Robert Dawson. |
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Finding an Acute Angle using Trigonometric Identities |
2009-06-29 |
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From Nazrul:
How can I find the value of A if sinA-cosA=1 , where A is an acute angle.
Answered by Stephen La Rocque. |
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A boat goes up stream 30 miles and ... |
2009-06-29 |
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From Mohsin:
A boat goes up stream 30 miles and down stream 44 miles in 10 hours. Again it goes up stream 40 miles and down stream
55 miles in 13 hours. Find the rates of the stream and of the boat.
I am confused and unable to get an answer. Please help.
Thanks
Answered by Robert Dawson. |
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Potential infinity and actual infinity |
2009-06-29 |
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From Justin:
Hi there, I was just wondering what is the difference between the potential infinity and actual infinity in math? Thanks a lot for your help with this question!
All the Best,
Justin
Answered by Robert Dawson. |
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Coefficient thermal expansion of steel |
2009-06-29 |
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From roshni:
Coefficient thermal expansion of steel is 0.00000645/in/in/deg F if F was C(celcius) then what is the answer
Answered by Robert Dawson. |
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Proportionality |
2009-06-29 |
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From Nazrul:
If x is proportional to y and y is proportional to z , how can I prove that (x^2+y^2)^3/2 is proportional to z^3
Answered by Harley Weston. |
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Integers and decimals in day to day life |
2009-06-29 |
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From mitichie:
can you tell use of integers and decimals in our day to day life.
Answered by Penny Nom. |
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Coffee scoops per cup |
2009-06-29 |
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From charity:
if my coffee machine takes 10 scoops for every six cups, how many scoops do i need for 4 cups.
each scoops equals one tbls(.25 oz)
Answered by Penny Nom. |
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Designing a shelf |
2009-06-28 |
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From Bjorn:
I'm putting up a shelf and thought I'd be nice and cut the sharp and pointy
corners off. I want to the cut to be at a 45 degree angle, but I also want
the exposed edge to be the same length as from the wall to the beginning of
the cut -- so the end of shelf will look like the first two sides of an octagon.
I've managed to construct the solution, but I haven't been able to calculate it...
Please help!
Answered by Stephen La Rocque. |
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Eight golfers |
2009-06-26 |
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From E:
Hello,
We have a golf tournament. 8 players, 3 days, 2 fourballs per day.
How can each player play with each other no more than twice, and at least once?
Would like a speedy answer as we're going tomorrow!
Thank you
Answered by Laura Morrison. |
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Height of a Flag Pole |
2009-06-26 |
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From Jake:
Can anyone answer this I am very stumped.
The flagpole on the roof of a Chocolate Factory is 13 cm in diameter and
a perfect cylinder. If one end of a 2300-cm-long string is attached to the top
of the flagpole, and wraps around the flagpole exactly 16 times before ending
at the bottom of the flagpole, how tall is the flagpole? Need answer by Wednesday
Answered by Penny Nom. |
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Twelve golfers |
2009-06-26 |
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From Fred:
Hello-
There are twelve golfers in 3 foursomes for three days. Is there a
combination of four man foursomes that allow for no duplicates? In
other words, is there a formula to insure the greatest amount of
variety in the foursomes. Looking at it math like you have
1,2,3,4,5,6,7,8,9,10,11,12 grouped into four numbers each for three
days. So if your have the first day 1,2,3,4 in one group, 5,6,7,8 in
the second and 9,10,11,12 in the third what can you do for the next
two days to have the fewest duplicates or have the greatest variety
in the foursomes?
Thanks
Answered by Karen Meagher and Victoria West. |
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Investing in multiple accounts |
2009-06-26 |
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From Kenneth:
Hello:
If an investor has $1000.00 to invest in multiple accounts, and he
wants a total return of 4%, is there one calculation that can be used
to determine what these amounts could be even though there may be
numerous amounts used as answers for most of the following examples?
For example,
Invest $1000.00 @ 2% and 5% for total return of 4%.
Invest $1000.00 @ 2%, 3% and 5% for total return of 4%.
Invest $1000.00 @ 2%, 3%, and 5% for total return of 4%.
Invest $1000.00 @ 2%, 3%, 4% and 5% for total return of 4%.
etc.
Answered by Robert Dawson. |
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