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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#1 Re: Guestbook » Heya EVERYONE REPLY! » 2010-06-07 06:21:24

JohnnyReinB wrote:

So, you both are from another planet? small universe!
I'm from pluto, actually.

But, Pluto is not a planet. It has been proven by someone who needs to get a life.

#2 Re: Coder's Corner » Programming Joke » 2010-06-07 06:11:10

I knew a fellow, early twenties, who aspired to be a professional programmer.

He showed me some code for a program he was writing (BASIC).

At one point he had code like

if x < 10 then
if x < 8 then
    (code)
else if x < 5 then
    (code)

Unfortunately, much of this sort of thing goes on in professional programming.

#3 Re: Maths Is Fun - Suggestions and Comments » Function Grapher and Calculator » 2010-06-07 05:46:51

MathsIsFun wrote:

The Function Grapher and Calculator is ready for you guys to try out. There are probably still bugs, and I don't mind if you tell me about them.

My idea is that we can use this thing to solve or illustrate problems, so I placed a special "Link" section - you can copy-and-paste the "forum" link into your message, and it will re-create the graph you made Have a try and tell me what you think.

I think you have a winner. Graphs are a big help in the understanding of math.

#4 Re: This is Cool » Girls just as good at mathematics as boys » 2010-06-07 04:20:40

MathsIsFun wrote:

It is just that girls have less confidence in the subject, according to this:

http://www.sciencedaily.com/releases/20 … 112303.htm

Actually, women, in general, are smarter than men. However, men have beaten them down for centuries, and they think they have to be "dumb" to please men. IOW, the fault is NOT theirs. It is YOURS.

WOMEN ARE SMARTER THAN YOU, SIR.

#5 Re: Help Me ! » entering a function into graphing calculator » 2010-06-07 04:12:09

56tracy wrote:

How do I enter the function Y^2=X into a TI 83 plus?  Thanks.

You don't. You enter
y=sqrt(x)

ALWAYS, you enter
y=(function)
the y= part is fixed. You can't change it. You have to manipulate the right side to make it equal y.

#6 Re: Help Me ! » please help with my questions. I'm not stupid, I'm 10 years old » 2010-06-07 03:34:17

56tracy wrote:

My questions may seem stupid to you guys but I'm only 10 years old and in 5th grade.  I'm actually 4-5 years ahead of my classmates and am beginning my study of algebra.  I'm just starting with the graphing calculator and some things are really confusing me.

I think you are one sharp cookie. Math is very difficult for most people. You seem to have a much better grasp of it than most HS grads.

#7 Re: Help Me ! » please tell me how to enter y^2 on the TI 83 plus » 2010-06-07 03:32:05

56tracy wrote:

I understand how to enter y=3x^2 + 3x -9 etc, etc, but how do you enter y^2=whatever?  Thanks!

If you are asking about a function in the evaluation program, they are ALWAYS y = (function of x)

for what you want, y = sqrt(FUNCTION)

#8 Re: Help Me ! » A couple of questions from a math test I took today » 2010-06-07 03:23:13

56tracy wrote:

1.  Is the 5th entry in the 8th row of Pascal's triangle the number 56? 

2.  The graph of a shown function crossed the x-axis at 4 and 0.  Does this mean there are 2 real zeroes?

1) No, 70. The fourth entry is 56.

2) Yes. They are at x=4, and x=0.

The equation is

y = (x-0)(x-4)

which is a quadratic

y=x^2-4x

#9 Introductions » Here to help. » 2010-06-07 03:16:32

KrazyKyngeKorny
Replies: 1

I am 70yo, and have been deeply involved in math, beginning when I was 4yo- 66ys. I deal in arithmetic, algebra, trigonometry, geometry, and, some differential and integral calculus.

If you get stuck, email me and I will help, if I can. I don't know all the answers, just a very large part of them.

#10 Re: Help Me ! » Angles of a Rhombic Dodecahedron? » 2010-06-07 03:07:36

shoegazer wrote:

Thanks Sunnym.  It wasn't what I was looking for but I appreciate the reply.

I realized that the answer is here:
http://mathworld.wolfram.com/RhombicDodecahedron.html
I just couldn't read the symbols.  There are two angles.
one is roughly 70.53 degrees and the other is roughly 109.47 degrees

Be sure your calculator is in degree mode. Punch in 1/3=
[2nd] cos

for a (alpha)

2 √
[2nd]tan
x2=
-180=
[+/-]

for the second angle.

The lines below x2 are to re-reference the angle from 180 degrees.

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