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Older Activity
Today,
02:51 AM
Denis
replied to a thread
Light bulb problem #1
in
Math Odds & Ends
Label the switches 1, 2 and 3. Turn on switch#1 for say 5 minutes, then turn it off. Turn on switch#2, then go in the room... The light that...
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1 replies | 30 view(s)
Today,
02:36 AM
Denis
replied to a thread
Heads, Tails or pass
in
Probability / Statistics
I think this should also work. The 3 players all follow the same strategy: if they see HH they guess T or if they see TT they guess H, else they...
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6 replies | 136 view(s)
Today,
12:51 AM
Jomo
started a thread
Last problem for today- Number Theory
in
Math Odds & Ends
Each of the digits from 0 to 9 appears in the number 229 once except for one. Which digit is missing?
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0 replies | 22 view(s)
Yesterday,
10:11 PM
Jomo
started a thread
Light Bulb problem number 2 (a bit harder)
in
Math Odds & Ends
There is a light in another room that can be in one of three states: blue red or off In your room, you have two buttons numbered 1 and 2 that...
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0 replies | 39 view(s)
Yesterday,
10:07 PM
Denis
replied to a thread
Final Review: Of 100 stadium workers, 42 work in concession stands, 88 wear name tags
in
Probability / Statistics
See if you follow this: a + b = 42 a - 5b = 0 5a + 5b = 210 (multiplied by 5) 6a = 210 + a = 35 Clear nuff?
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5 replies | 143 view(s)
Yesterday,
09:56 PM
Jomo
started a thread
Light bulb problem #1
in
Math Odds & Ends
There are three working light bulbs in one room. The switches to these bulbs are in another sealed room. The switches are clearly labelled on/off and...
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1 replies | 30 view(s)
Yesterday,
09:20 PM
JeffM
replied to a thread
Related rates problem
in
Calculus
Actually, I think you made two errors. I kept trying to make sense of your original post and getting all mixed up. It was only when I went back to...
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8 replies | 126 view(s)
Yesterday,
08:56 PM
JeffM
replied to a thread
Final Review: Of 100 stadium workers, 42 work in concession stands, 88 wear name tags
in
Probability / Statistics
Because Halls already gave you an answer, I shall show you how to solve this using basic algebra. a = \text {number in concession with name tags.}...
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5 replies | 143 view(s)
Yesterday,
08:33 PM
Subhotosh Khan
replied to a thread
Math question on environmental chemistry.
in
Intermediate/Advanced Algebra
What are your thoughts regarding the assignment? Please share your work with us ...even if you know it is wrong. If you are stuck at the...
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1 replies | 31 view(s)
Yesterday,
08:29 PM
Subhotosh Khan
replied to a thread
Please help with this question
in
Probability / Statistics
What are your thoughts regarding the assignment? Please share your work with us ...even if you know it is wrong. If you are stuck at the...
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1 replies | 33 view(s)
Yesterday,
07:19 PM
Linty Fresh
replied to a thread
Related rates problem
in
Calculus
Thanks, Jeff. You made it look so simple. I was too hung up on the Pythagorean theorem, and I didn't realize what the velocity of the shadow...
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8 replies | 126 view(s)
Yesterday,
06:34 PM
JeffM
replied to a thread
Related rates problem
in
Calculus
I think you have made this much more complex than it need be. Using your definitions \dfrac{dx}{dt} = 5. u = x + s. You are asked to find...
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8 replies | 126 view(s)
Yesterday,
05:46 PM
Jomo
replied to a thread
Related rates problem
in
Calculus
Since x=40+s we get dx/dt = ds/dt. Now using your definition of the length finish the problem. If you need help, then tell us where you are stuck.
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8 replies | 126 view(s)
Yesterday,
04:43 PM
Linty Fresh
replied to a thread
Related rates problem
in
Calculus
Sorry, still a bit confused. So to find ds/dt, should I go back to the Pythagorean theorem and frame it in terms of "s"? In other words,...
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8 replies | 126 view(s)
Yesterday,
04:31 PM
JeffM
replied to a thread
Heads, Tails or pass
in
Probability / Statistics
I can get to 75% probability of success with the strategy that anyone who sees like guesses un-like; anyone who sees unlike passes. But I have only...
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6 replies | 136 view(s)
Yesterday,
03:09 PM
HallsofIvy
replied to a thread
newbie DE question: "y'' + y = o is important because it appears in physics." How?
in
Calculus
I presume, since you are asking about differential equations, that you have taken calculus and know that y'' is the second derivative. If, for...
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9 replies | 230 view(s)
Yesterday,
03:09 PM
Raja
started a thread
Math question on environmental chemistry.
in
Intermediate/Advanced Algebra
As simple as it seems? or is there more than meets the eyes? Please help, I'm confused :sad:
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1 replies | 31 view(s)
Yesterday,
03:02 PM
Dr.Peterson
replied to a thread
Heads, Tails or pass
in
Probability / Statistics
They can certainly do that; but since the statements are simultaneous, they can't make use of the logic. What they've said, they've already said...
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6 replies | 136 view(s)
Yesterday,
02:59 PM
Raja
started a thread
Please help with this question
in
Probability / Statistics
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1 replies | 33 view(s)
Yesterday,
02:10 PM
Denis
replied to a thread
Heads, Tails or pass
in
Probability / Statistics
As strategy, can they have one guy pass every time he sees 2 same (and at no other time), which means the other 2 guys would then know what's on...
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6 replies | 136 view(s)
Yesterday,
01:53 PM
Dr.Peterson
replied to a thread
newbie DE question: "y'' + y = o is important because it appears in physics." How?
in
Calculus
Well, presumably that is what your course is about! The answer to the question, "How can you find a solution?" may take a whole textbook,...
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9 replies | 230 view(s)
Yesterday,
01:53 PM
Denis
replied to a thread
Solving Equations Using Rational Expressions: Simplify x/(x+3) + (9x+18)/(x^2+3x)
in
Intermediate/Advanced Algebra
Or start by beating d'heck out of that "9x + 18": 9x + 18 = 3x + 6x + 18 = 3x + 6(x + 3) : so another (x + 3) to cancel out :rolleyes:
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9 replies | 231 view(s)
Yesterday,
01:47 PM
Denis
replied to a thread
Solving Equations Using Rational Expressions: Simplify x/(x+3) + (9x+18)/(x^2+3x)
in
Intermediate/Advanced Algebra
........
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9 replies | 231 view(s)
Yesterday,
12:54 PM
Vol
replied to a thread
newbie DE question: "y'' + y = o is important because it appears in physics." How?
in
Calculus
OK. I get it. You have to solve for y by finding f(x), which is sin or cos in this case. But how did you find sin or cos? And what if we were to...
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9 replies | 230 view(s)
Yesterday,
12:47 PM
Dr.Peterson
replied to a thread
Solving Equations Using Rational Expressions: Simplify x/(x+3) + (9x+18)/(x^2+3x)
in
Intermediate/Advanced Algebra
And here is the usual method that I mentioned: \displaystyle\frac{x}{x+3}+\frac{9x+18}{x(x+3)} = \frac{x\cdot x}{(x+3)\cdot...
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9 replies | 231 view(s)
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