All Answers

+72

Thanks alot Alan and I Like Serena!! I really appreciate your help!! Thanks!!

Princess Sophie EMar 26, 2014

+142

Mthsmename:
24squared + b squared = 25squared

You mean 24 ² + b ² = 25 ²?

ok, 24 ² = 576

25 ² = 625

So you habe 576 + b ² = 625

sqrt(b ²) = sqrt(625-576)

b = _____________

solve(24^2+b^2=25^2, b)

You have to forget the negative 7, you don't need it . You'll need it only if you are in a grafic...

samgelinasMar 26, 2014

in order to figure out what m and r are you must display if it is subtraction, addition, multiplication, or division
other wise it could be a multiple of answers

KasiKazutoMar 26, 2014

+33668

Ok, having now looked more carefully at the second problem I can see that you need to do a little more than in the first problem, so:

Larry.PNG

AlanMar 26, 2014

+130577

The diameter is 2

To see this, note that the circumference is given by C = 2πR, or C=2Rπ. But 2R = D, where D is the diameter.

Therefore, C=Dπ

So 6.28 = Dπ

And if we let π = 3.14

Then, 6.28 = D * 3.14

So D = 6.28 / 3.14 = 2

CPhillMar 26, 2014

ment to say equal

GuestMar 26, 2014

+142

s07778673:
:x find the area of similar figures

Heum...I hope there's more information in your question than this...

If not, I'm sorry I can't help you...I just don't understand...

samgelinasMar 26, 2014

+118735

Thank you Alan, I didn't realise that they were there.

MelodyMar 26, 2014

#82

+118735

Hi all,
Another quiet day. Where have all the young people gone?
There were a number of high level questions with great high level answers.
Answers were provided by CPhill, Rom, reinour-g, Stu, Bertie, Alan, I like Serena, Samgelinas, anonymous1, and PhDSmith. Thank you all.
Dr. Smith became a member today. Welcome to the forum, we hope you like it here. I wonder if you saw my 'Lost in Space' post recently? It wasn't there long, I deleted it. So maybe not.
The only question not yet answered is the Hyperbola Proof by CPhill.

A note mainly for the younger people:
I am wondering why there are so many less low level questions the last couple of days than I would normally expect. Lower level questions are very welcome here. Don't be intimidated by the harder questions. I want this forum to be available, useful and friendly for all ages and abilities. Some of the other mathematicians have told me that that is what they want too. If you are not completly happy with an answer, please tell us. You can tell us that you don't understand any of it, or some of it. You can tell us that your teacher does it differently and then we will try to show you your teacher's way. We like to get feed back. You can help us to learn the best ways to teach.

That is it for tonight.
Melody.

MelodyMar 26, 2014

+33668

Here's the first one. See if you can use a similar approach on the second one.

family.PNG

AlanMar 26, 2014

+33668

Melody:
3^x=30

I...
This is a handy page to keep nearby when you are dealing with logs although eventually you will need to memorise all the identities.

http://en.wikipedia.org/wiki/List_of_logarithmic_identities

Also, this site has lots of useful identities listed. Just select Formulary from the ribbon at the top of the page.

AlanMar 26, 2014

+118735

pancakes:
What the XXXX?

Hello Pancakes,
I don't mind you bopping along around in here. I want this to be a site that is both friendly and helpful for children, BUT the language you have used here is not acceptable.
Find yourself some cleaner words with which to express you amazement. There are plenty of them. Use your imagination.
Melody.

MelodyMar 26, 2014

+118735

3 ^x=30

I just want to stress the first step

log 3 ^x= log 30

but log 3 ^x = xlog3
that is how Rom got

xlog3 = log 30

This is a handy page to keep nearby when you are dealing with logs although eventually you will need to memorise all the identities.

http://en.wikipedia.org/wiki/List_of_logarithmic_identities

MelodyMar 26, 2014

+118735

I think that to enter a mixed numeral you probably have to do this

1+1/6

And if you want to do calculation with mixed numerals you probably need to use brackets

(6+3/4)-(9+1/2)

Am I right or is there another way?

Oh and Shelly,

[size=150]The calculator input is displayed between the 'math' boxes under the black output boxes. [/size]

MelodyMar 26, 2014

Mar 25, 2014

+118735

sam:
segment MN with endpoints M(12,-7) and N(-5,-2) find the coordinates

M and N ARE the coordinates of the endpoints. What are you actually asking?
Maybe you want the formula of the line or the gradient?

MelodyMar 25, 2014

+118735

Gib:
Hello,

I live in a giant bucket

-Gib

Hi Gib,
I hope that it is not too tall and out in the weather or else you might drown when it rains heavily - unless of course there are holes in the bucket.
Or is the bucket upside down? Can you show us a picture of your bucket house? I expect that you are very proud of it.

MelodyMar 25, 2014

+118735

jtaylo45:
3x - 7 = x + 11 then 2x + 1 =

Anonymous solved for x first which is a good way to tackle a problem like this one.
3x - 7 = x + 11
subtract x off both sides
2x-7 = 11
add 7 to both sides
2x-7+7=11+7
2x=18
now you can finish the solution and get x=9 and then sub 9 into the new expression to the value.
OR
you can just say
2x+1=18+1=19

both ways are good.

MelodyMar 25, 2014

the answer is x=9, then use that 9 plug it in for x and then you have the answer of 19.

GuestMar 25, 2014

+33668

I'm a bit out of my depth here (well, ok, a lot out of my depth!), but I think I might try to get an understanding by generating some specific examples using small matrices; e.g. choosing n = 3 and m = 1, say, so that A is a 3x3 matrix, B is a 1x3 vector, O is just the scalar 0, H is a 4x4 matrix and k would have just two values, 0 and 1. Fill A and B with some (randomly chosen?) test values to see if you can generate values that satisfy each of your three conditions in turn. I don't know if this is feasible, or even if it helps if it is, but it's the best I can come up with!

AlanMar 25, 2014

320/3= 106.666666667

PhDSmithMar 25, 2014

the formula is force/mass. In this case, force is 2552 and mass is 2250 lbs. So now, the formula is 2522/2250= a. a=2.5 m/s sq. Hope this helps.

-PhD Smith

PhDSmithMar 25, 2014

+142

324394:
320/3what is 320/3

I just correct you.

samgelinasMar 25, 2014

+135

Princess Sophie E:
The electrostatic force between two charges Q1 and Q2 at a distance r apart is given by F=(Q1*Q2)/(4Pie*Eo*r^2). What is the unit of E?