Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#26 Re: Help Me ! » fractions!!!!! » 2008-05-19 02:04:22

That's right Johnny just to clarify. You replace all "X" in the function with whatever number is in the function notation "F(whatever)"

#27 Re: Introductions » (Introduce myself) » 2008-05-18 15:21:18

Hello I hope you find the forum both informative and entertaining. Enjoy your use. smile

#28 Re: Jokes » Joke of the day » 2008-05-18 11:25:25

LONG day at work today. It isn't often that both jobs fall on the same day, but when it does, it's a doozy! Anywho, I hope everyone is having a great day and that you enjoy this joke:

A man and a friend are playing golf one day at their local golf course. One of the guys is about to chip onto the green when he sees a long funeral procession on the road next to the course. He stops in mid-swing, takes off his golf cap, closes his eyes, and bows down in prayer. His friend says: “Wow, that is the most thoughtful and touching thing I have ever seen. You truly are a kind man.” The man then replies: “Yeah, well we were married 35 years.”

#29 Re: Jokes » Joke of the day » 2008-05-17 05:05:00

Two weeks left until my trip to Hawaii!!! I'm counting down the seconds. Anyone ever been there? If you have tell me your opinions and must see attractions, etc. Thanks a lot in advance, now for today's joke:

Sherlock Holmes and Dr. Watson go on a camping trip. After a good dinner and a bottle of wine, they retire for the night, and go to sleep. Some hours later, Holmes wakes up and nudges his faithful friend.
"Watson, look up at the sky and tell me what you see.”
I see millions and millions of stars, Holmes,” replies Watson.
“And what do you deduce from that?”
Watson ponders for a minute.
“Well, astronomically, it tells me that there are millions of galaxies and potentially billions of planets. Astrologically, I observe that Saturn is in Leo. Horologically, I deduce that the time is approximately a quarter past three.
“Meteorologically, I suspect that we will have a beautiful day tomorrow. Theologically, I can see that God is all powerful and that we are a small and insignificant part of the universe. What does it tell you, Holmes?”
Holmes is silent for a moment. ‘Watson, you idiot!” he says. “Someone has stolen our tent!”

#30 Re: Jokes » Joke of the day » 2008-05-16 00:42:44

Work early this morning, blah. Here's the joke for today:

A couple of New Jersey hunters are out in the woods when one of them falls to the ground. He doesn’t seem to be breathing, his eyes are rolled back in his head.

The other guy whips out his cell phone and calls the emergency services. He gasps to the operator: “My friend is dead! What can I do?”

The operator, in a calm, soothing voice, says: “Just take it easy. I can help. First, let’s make sure he’s dead.”

There is a silence, then a shot is heard. The guy’s voice comes back on the line. He says: “Okay, now what?”

#31 Re: Help Me ! » Equations? HELP! » 2008-05-15 15:54:36

For the second one just do the same thing as the first one:
2y=3x+15                                   2y=3x+15
y=(3x+15)/2                             3x=2y-15
                                                  x=(2y-15)/3

#32 Re: Jokes » Joke of the day » 2008-05-15 07:11:50

It sure is. Instant classic. big_smile

#33 Re: Jokes » Joke of the day » 2008-05-15 03:38:01

Here's today's joke, enjoy:

A man goes to a psychiatrist and says, "Doc, my brother's crazy, he thinks he's a chicken." The doctor says, "Why don't you turn him in?" The guy says, "We would. But we need the eggs."

#34 Re: Help Me ! » Help Me Pretty Plz!!! Numbers! » 2008-05-14 15:16:47

Factor form? I'm assuming that this is the same thing as factoring it.
There are several different methods.
Here's a hint: quadratic formula or completing the square.
Post again if you want more help. smile

#36 Re: Jokes » Joke of the day » 2008-05-14 03:22:43

Gee thanks I try big_smile Here's today's joke (Hope it meets your standards wink), this is not so much a joke as something that really happened but when I tell it people will think I've made it up. Here it goes anyways:

My friend Matt and I were in the checkout line at Walmart and he's holding a 20lb bag of dog food. We are chatting when this woman behind up clears her throat loudly and asks if he owned a dog. Now there's something you need to know about my friend Matt, he's about the most sarcastic person you're likely to ever meet besides me of course. Anyways he turns to her and says, "No, I was just thinking about getting back on the Purina diet. Last time I was on it I lost a good 40lbs. It's quite simple, carry around some of the dog food in your pocked and eat a bit when you get hungry. It's nutritional and filling." By this time everyone in our lane and the neighboring one's is pretty much enraptured by his story. He continues, "There was one problem though. Towards the end of the diet I woke up in the hospital with tubes coming out of me and an enormous IV." The woman is shocked and asks, "What happened, the dog food can't be that bad for you?" He replies, "It's not, I was walking home one day and stepped off the curb to sniff an Irish Setter's butt and we both got hit by a truck!" The woman turns bright red and promptly leaves the line and everyone else can't stop laughing.
The reason that this is so funny is because it really happened and that Matt put so much effort into drawing out this story just to make that woman look stupid. This story never gets old.

#37 Re: Help Me ! » Help Me Pretty Plz!!! Numbers! » 2008-05-13 13:43:08

Lets take it slowly this time... The formula to determine whether it's rectangular is x(x-1) and the number you want to check is 110. I hope you're following me O.o. So... you set them equal to each other like this: 110 = x(x-1) then you solve.

Step 1.
110 = x(x-1)
Step 2... distribute the x.
110 = x^2-x
Step 3... subtract 110 from both sides.
x^2-x-110
Step 4... apply the quadratic equation.
...
Step 5... determine solutions.
The answers turn out to be 11 and -10
Since you're answers are integers (and therefore rational numbers) then you know that the number is rectangular.

#38 Re: Help Me ! » Help Me Pretty Plz!!! Numbers! » 2008-05-13 13:13:52

No you don't replace it with x, you set it equal to x.

So:
Squared: 110=x^2
Triangular:110=x(x-1)/2
Rectangular:110=x(x-1)

#39 Re: Help Me ! » Help Me Pretty Plz!!! Numbers! » 2008-05-13 12:43:25

Using your example where the number you are looking at is 110, to determine if it is squared, rectangular, or triangular set it equal to each of the terms then solve for x. So:
110=x^2
110=x(x-1)
110=x(x-1)/2
Whichever gives you a whole number for an answer is the solution... I think. I'm not 100% sure on this but I think that's how this goes. Some confirmation from someone would be nice. x_X

#40 Re: Jokes » Joke of the day » 2008-05-13 04:17:30

All right I'm getting back into the swing of things, aka. waking up before 11 on average. =P Also, I threw 4 under par playing disc golf, I'm proud even though my other two friends threw 6 and 9 under. XD Enough of that thought, here's today's joke:

Bill Clinton is visiting a school. In one class, he asks the students if anyone can give him an example of a "tragedy." One little boy stands up and offers that, "If my best friend who lives next door is playing in the street when a car came by and killed him, that would be a tragedy."
"No," Clinton says, "That would be an ACCIDENT."
A girl raises her hand. "If a school bus carrying fifty children drove off a cliff, killing everyone inside...that would be a tragedy."
"I'm afraid not," explains Clinton. "That is what we would call a GREAT LOSS."
The room is silent; none of the other children dare volunteer.
"What?" asks Clinton, "Isn't there anyone here who can give me an example of a tragedy?"
Finally a boy in the back raises his hand. In a timid voice, he says: "If an airplane carrying Bill and Hillary Clinton was blown up by a bomb, *that* would be a tragedy."
"Wonderful!" Clinton beams. "Marvelous! And can you tell me WHY that would be a tragedy?"
"Well," says the boy, "because it wouldn't be an accident, and it certainly would be no great loss!

#41 Re: Dark Discussions at Cafe Infinity » Anyone play disc golf? » 2008-05-13 03:32:45

Free!! That's the great thing, most fields across the nation are free. The only thing you need to provide are discs which are low priced anyways (ranging from 7-20 dollars) so it's a relatively inexpensive past time as well.

#42 Re: Dark Discussions at Cafe Infinity » Anyone play disc golf? » 2008-05-12 16:19:08

I play almost every day and the course near me is really hilly so it's a good workout as well as fun. I shot 4 under par today!! big_smile

#43 Re: This is Cool » Yay for a wacky proof! » 2008-05-12 03:30:37

Yes but whether or not the "a" is negative or positive must be established before applying the property and that's not the case here because the property is applied before pi is substituted in.

#44 Re: This is Cool » Yay for a wacky proof! » 2008-05-12 03:17:55

That's correct, but the more obvious fallacy lies in the property:


This property holds true for fractional exponents as well, but only when a is positive, which is not the case for the trig function.

#45 Re: Help Me ! » Need Answers Please » 2008-05-12 03:07:34

More of the same I guess: a wheel travels 2πr per revolution.  and average speed is d/t, where d is distance traveled and t is time. So if your distance is 1000 revolutions and you're time is 12 minutes, then your speed is (2000πr)/12. Hope this adds something >.<

-- yeah, for some reason my pi symbol comes up like this π so... yea

#46 Re: Jokes » Joke of the day » 2008-05-12 02:42:17

I'm feeling a funny picture today as well, this is for those blonde mathematicians out there XD :

funnymath2.gif

#47 Formulas » Maxwell's Equations » 2008-05-12 02:26:52

SvenBee
Replies: 0

is the electric field.
is the magnetic field strength.
is the electric displacement field.
is the magnetic flux density.
is the free electric charge density.
is the free current density.
is the differential vector element for surface area A with infinitesimally small magnitude and direction normal to surface S.
is the differential volume V enclosed by surface S.
is the differential vector element of path length tangent to contour C enclosing surface c.
is the instantaneous velocity.
is the divergence operator.
is the curl operator.

[align=center]Differential Form[/align]

Gauss' Law:


Gauss' Law for Magnetism:

Faraday's Law of Induction:

Ampere's Law:

[align=center]Integral form[/align]

Gauss' Law:


Gauss' Law for Magnetism:

Faraday's Law of Induction:

Ampere's Law:

#48 Re: Jokes » Joke of the day » 2008-05-12 01:23:03

Thank you very much mathisfun. Just so everyone knows I'll be here asking for lots of help in the future (I plan to be a math major), I'm going to college at WPI (Worcester Polytech Institute) in Mass. if anyone is familiar with it tell me the ups and downs. Anyways here's today's joke:



A driver is pulled over by a policeman. The police man approaches the driver's door.
"Is there a problem Officer?"
The policeman says, "Sir, you were speeding. Can I see your license please?"
The driver responds, "I'd give it to you but I don't have one."
"You don't have one?"
The man responds, "I lost it four times for drunk driving."
The policeman is shocked. "I see. Can I see your vehicle registration papers please?"
"I'm sorry, I can't do that."
The policeman says, "Why not?"
"I stole this car."
The officer says, "Stole it?"
The man says, "Yes, and I killed the owner."
At this point the officer is getting irate. "You what!?"
"She's in the trunk if you want to see."
The Officer looks at the man and slowly backs away to his car and calls for back up. Within minutes, five police cars show up, surrounding the car. A senior officer slowly approaches the car, clasping his half drawn gun.
The senior officer says "Sir, could you step out of your vehicle please!"
The man steps out of his vehicle. "Is there a problem sir?"
"One of my officers told me that you have stolen this car and murdered the owner."
"Murdered the owner?"
The officer responds, "Yes, could you please open the trunk of your car please?"
The man opens the trunk, revealing nothing but an empty boot.
The officer says, "Is this your car sir?"
The man says "Yes," and hands over the registration papers.
The officer, understandably, is quite stunned. "One of my officers claims that you do not have a driving license."
The man digs in his pocket revealing a wallet and hands it to the officer. The officer opens the wallet and examines the license. He looks quite puzzled. "Thank you sir, one of my officers told me you didn't have a license, stole this car, and murdered the owner."
The man replies, "I bet you that old liar told you I was speeding, too!"

#49 Re: This is Cool » Yay for a wacky proof! » 2008-05-12 01:15:40

So close but not quite on target, 5 points. big_smile

#50 This is Cool » Yay for a wacky proof! » 2008-05-11 15:05:58

SvenBee
Replies: 7

All right 10 points to whomever finds the fallacy in this proof big_smile

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