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alkhateep abdo:
what should be the dimensions of a rectangle whose area is equal to area
with that fence enclosing it on three sides had a lack of duration

could you try to re-word this please. It doesn't make a lot of sense.

MelodyDec 20, 2013

+118725

sema:
2log125_3log x=3

I am sorry sema, I don't understand your question. What is the underscore for?
I think it is a minus sign.

Here is a list of log identities that you can use.
http://en.wikipedia.org/wiki/List_of_logarithmic_identities
I haven't actually done your questin yet but I think that you will use the second one and the third one in the main list.
There will be a little more to it than that.
Use the hint below to help you solve the equation.

hint: if
log x=6
then
10^(logx) = 10^6
x=10^6

get back to me and tell me how you go.

MelodyDec 20, 2013

+118725

Hi David,
Thank you for the information and for your support.

I stumbled upon this forum less than 3 months ago. At that time is was little more than a low level chat room for children. Only a few maths questions were being posted and very few of those attracted any serious answers. I was only just discovering the joy of forums at that time and I recognised that this had the potential to be a jewel.

In three short months the forum has moved to where it is today. Now there is a group of core users, all of whom are really nice young people. Bullying has almost been abolished. Some of the core people let the potential bully know very quickly that his/her behaviour is not appreciated and, to my surprise, potential bullies seem modify their behaviour accordingly.
I don't mind having some snarky behaviour. It is a children's forum after all and most are just having fun. I find the revolving percent question quite amusing. What does worry me is that I think someone has tweaked the programming. That percent question is appearing in a number of 'new' posts. This is of particular concern because when the young person tires of the forum and moves on, his/her viral legacy is likely to stay behind.

The webmasters are conspicuously silent on this site. I have sent them a few messages and they have never responded. Very occasionally the administrators do post a calculator output but it is very random and never comes with any explanation. Of course it may not even be the administrators. Anyone can call themselves admin in this forum. In almost all ways it would be better if people had to register in order to make posts. The webmasters really don't seem to care what goes on here.

Some of the other forum users are starting to answer questions on a regular basis, and some of those people are very capable. I really try to encourage this, teaching is a learned skill too, it is a skill that some are very keen to develop. I want this forum to be self sustaining. If it continues to be reliant on only one or two 'teachers' then it is not likely to have longevity. I could probably bring in more high level people but I don't really want to do that. I want the children to mould their own forum. I too have learned a lot, mainly by seeking out you tube clips and other information to aid with my answers. I only discovered Latex about a month ago and I am quite proud of my use of it now. Some of the other users have also taught me things. Only the other day, a seven year old core member taught me what 'tia' meant (in Spanish).

I am now to a point where I want to develop more interactivity. People learn better if it is interactive and plus, like you said, there is not a lot of point doing excess teaching if no one is actually listening. I am sure many of the children don't realise that 'real' people answer their questions. Maybe I am too forgiving but I think that this is the nature of the child and most of the time I am prepared to wear it.

There is a facility for private messages here but I don't think it works for me. I have received messages but the replies that I send appear to remain in my out box. Maybe their server doesn't handle Australia. This is a disappointment for me; I would really like to be able to send private messages sometimes.

Anyway, thank you for your support and welcome to Web2.0calc forum. I hope you stay and become a part of our happy community.
Melody.

Snark - Graph theory.JPG

MelodyDec 20, 2013

its 1.020408163265306 1

Quote:
Quote:

GuestDec 20, 2013

+118725

Kerri:
How do you find the missing side of a right triangle using sin cos tan?

first you draw a right angled triangle and mark the right angle.
now mark the other angle that you know and the side that you know.
now pick up a different coloured pen.
Us it to
put H on the hypotenuse.
put coloured dot on the vertex of the angle that you know
one of the sides touching that dot is the hypotenuse, the other is the adjacent side (adjacent means next to - the house that is adjacent to your house will share a common fence.)
Put an A on the adjacent side.
The other side, that doen't touch the dot is the opposite side (The house opposite yours is on the other side of the street, it does not touch your property.)
Put an O on the opposite side.
now, you have 1 side and you want to find another side so you care about those 2 sides. The third side you don't have and you don't want so it doesn't matter.
Put a circle around the letter on the 2 sides that you care about.

Now choose the ratio that uses those 2 sides

if you remember this it will help
some old hags sin(theta)=o/h
cant always hide cos(theta)=adj/hyp
their old age tan(theta)=opp/adj

Or maybe you will use
SOH CAH TOA
to help you remember.

Make up an equation and then solve it to find the side.

MelodyDec 20, 2013

+118725

Guest:
:cry: A cyclist is traveling at an initial speed of 10.0 m/s. She accelerates at a rate of .500 m/s. What is her final speed after 9.0s?

Firstly, 0.5m/s is not a measure of acceleration (it is velocity, or speed). So I will change it to 0.5m/s ²
Next, I will assume that the ground is flat so gravity doesn't need to be considered.

Initially, when t=0
x = 0
x' = 10m/s
x" = 0.5m/s ²

Ongoing
x" = 0.5
x' = 0.5t + c substitute in t=0, x'=10 and you get c=10
x' = 0.5t + 10
x = (0.5t ²)/2 + 10t + k substitute in t=0, x=0 and you get k=0
x = 0.25t ² + 10t

Now, when t=9
x= (0.25 x 81) + (10 x 9)
x= you can finish it and don't forget the units.

and, you can stop crying now.

MelodyDec 20, 2013

+118725

There is a calculator on this web site for you to use so you probably don't need to ask us.

And pi doesn't have an e on the end except if you are going to eat it.

MelodyDec 20, 2013

+118725

syd:
how do you evaluate the expression h(a) if h(x)=12/x?

Whatever was in the brackets to start with is replace by the new thing in the bracket.
so

h(a) = 12/a

and, that is finished.

MelodyDec 20, 2013

+118725

mishl002:
what is 1.25% of $990.00

% means divide by 100, of means multiply
so now you can do it yourself.

MelodyDec 20, 2013

+118725

amber alexander:
how to put in residuals in a calculator

You will need to give an example of what you mean.

MelodyDec 20, 2013

+118725

jp13aav:
what is INV

this is the working out and answer to a question

θ = INV Sin0.75 = 48.6o
What does the INV mean?

inv stands for inverse.
for example
sine 30 ^o=0.5
so
Inverse sine 0.5 = 30 ^o

Inverse sine 0.5 can also be referred to as arcsine 0.5 and it can be written a number of different ways.
the most common ways are
sin ^-10.5 This is easily confused with (sin 0.5) ^-1 (but it is completley different in meaning) And for this reason I think this notation is silly but it is the most common notation.
and
asin0.5 I like this notation much better but it is less common.

The inv in your question is not proper maths notation it is just trying to give you guidance for how it is done on a calculator.

If you look at the sin button on your calculator, above it probably in a different colour is sin ^-1
To use this key, you have to press another key usually in the top left corner of your calculator first.
It will be marked as INV or possibly 2nd Function
That is the button that your INV is referring to.

Remember, before you do any of this make sure that your calculator is set to degrees. There should be a tiny little D at the top of your display panel. It will be there all the time unless you change it to something else.

To sum up
You have to press the INV key if you are looking for an angle.

MelodyDec 20, 2013

+118725

thatperson:
infinity divided by zero

That is undefined.

MelodyDec 20, 2013

hmmmmmmm, hard one. i waould have to go with 5...... but i may be off by one or two.

GuestDec 20, 2013

Dec 19, 2013

#14

+118725

I hope that all your study pays off well.

You don't need to do anything now. Maybe you will do it when all your exams are finished. I certainly don't want to put more pressure on you.

Try joining up properly and then you can send me a private message. If I receive one I will respond quickly.
In the past this has not worked for me. I have received some messages but I don't think that the messages I send ever leave my outbox.
Anyway I would like to see if I can reach you that way.

Thanks
Melody.

MelodyDec 19, 2013

#13

I certainly would like to chat, but how? Also probably not yet today because I have to be up the whole night and study, so I'll probably sleep through the whole afternoon (which will be in about 14 hours here). But after all that, I'd love to.

GuestDec 19, 2013

+118725

Stuck34:
----------------------------------------------------------------------------------------------------
So is the answer to the entire question 3??

Well,
What you need do is put
24 divided by (3 x 2) =
into a calcuator and see if you get the desired answer which is 4.
You can click into 'scientific calculator' at the top of this page and use that one if you want. Don't forget the brackets.
If the calculator says that the answer is 4 then your answer is correct. If it gives a different answer then your answer is wrong.
so you tell me, is your answer, 3, correct?

MelodyDec 19, 2013

#12

+118725

Yes, I am not a language person at all. I only speak English and when i was at school English was my worst subject. I am always astonished that students (like the ones at the international college and like yourself) can study difficult subjects in a foreign language. I don't think I ever could have done that!
I have never really studied grammar but I do think i would find it easier than other facets of language because there are at least rules that can be followed.
I think it would be easier to learn another language if you first formally understood the grammar of your own language. I think that would give you a starting point for comparisons.
As I said, I don't speak another language so this could all be nonsense.
I have had fun chatting and working with you on this question. If you want to chat more, that would be nice.
Thanks.
Melody

MelodyDec 19, 2013

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