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amazing! will let you know if anything is wrong Aziz!

thank you Aziz for the hard work! i will let you know later today if they are correct!

I've never heard of a Klein Bottle before.

There're weird!  Sort of a 3 dimensional version of a mobius strip? 

There are instructuions in this wikipaedia page on how to make one!  Does someone want to give it a go?

You could upload a photo of your creation to show us!

Usually it is me that turns a mole hill into a mountain. 

I am glad that other people do this sometimes too.  lol.

Well 10% of 10000 = 10/100*10000=1000

But what has the 35 years got to do with anything? 

Your question is incomplete.  

Thanks Chris   ,  sorry 15x3 there has been a lot of questions and I only just got back to yours. 

Thanks Alan, that makes sense now :)

Think of this as a function t(n) = n - 1

t(1) = 0

t(2) = 1

t(3) = 2

...

t(10) = 9

t(11) = 10

...

t(99) = 98

t(100) = 99

Clearly t(100) = 99 = 98 + 1 = t(99) + 1

Also t(11)² - 1 = 10² -1 = 99 = t(100) = t(99) + 1

I'm not sure I'd classify this as one of life's great mysteries!!

All that needs to be done to find the maximum and minimum depths is to note that sin has a maximum of 1 and a minimum of -1, so the maximum depth will be 4.5 + 1.5 = 6, and the minimum will be 4.5 - 1.5 = 3.

If the times at which they occur are needed then we can just set pi*t/12 = pi/2 or t=6 (and every 24 hours (?) thereafter) for the maximum and pi*t/12 = 3pi/2 or t = 18 (and every 24 hours thereafter) for the minimum.

The calculus approach, though perfectly valid, is overkill here!

I think the Math Formula tab was used to enter this question.  See for example:

$$\mathrm{ERROR}{\mathtt{\,-\,}}{\mathtt{22}}{\mathtt{\,-\,}}{\mathtt{22}}{\mathtt{\,-\,}}{\mathtt{20}}$$

I used the Math Formula tab and entered: find the mean -22 -22 -20 to get this. The Math Formula tab doesn't like spaces between words; it thinks words are variable names.

First do 45 + 9 = 54, then add 1/2 + 2/3 

$$\frac{1}{2}+\frac{2}{3}=\frac{3}{6}+\frac{4}{6}=\frac{7}{6}=1\frac{1}{6}$$

$$45\frac{1}{2}+9\frac{2}{3}= 55\frac{1}{6}$$

A Klein bottle has no interior and no exterior so it has zero volume!

ok that is weird!

$$You use inverse trig when you need to find an angle.\\\\
$sin^{-1}(0.8)$ means find the angle (I'll call it $\theta$ where $sin\theta = 0.8$)\\\\
Then as Aziz said \\
inverse sine is the same as arc sine\\
$sin^{-1}$ is the same as asin.$$   

Thanxx my friend 

No problem and it sure has a funny name...foot pound! Imagine a liter pound...or even a kilometer pound. !

It looks like this for some reason:

-7(a^2)(-b^3)

$${\mathtt{\,-\,}}\left({\mathtt{7}}{\mathtt{\,\times\,}}\left({{\mathtt{a}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}\left({\mathtt{\,-\,}}\left({{\mathtt{b}}}^{{\mathtt{3}}}\right)\right)\right)\right)$$

-7*$${\mathtt{\,-\,}}\left({{\mathtt{a}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{{\mathtt{b}}}^{{\mathtt{3}}}\right)$$

-7-(a^2-b^3)

-7a^2b^3 This is the finally anwser

What are you talking about Aziz?

You need more than one score to get a median.  The median is the midle score.

I suppose that if the only score is -43 then the median is -43  lol.

six =6

seven =7

So that 6 + 7 is 13,

I think that's a simply question.

7P5 ways put it into the web2 calc as

nPr(7,5)

$${\left({\frac{{\mathtt{7}}{!}}{({\mathtt{7}}{\mathtt{\,-\,}}{\mathtt{5}}){!}}}\right)} = {\mathtt{2\,520}}$$

This means how many permutations of 5 objects can be chosen from 7 objects (order matters)

or you could say that there  are 5! ways to order the childrens and for each of  those there is 7C5 ways that the seats can be choosen (ah that is the way CPhill looked at it)

5! * 7C5

enter the web2 calc as 5!*nCr(7,5)

$${\mathtt{5}}{!}{\mathtt{\,\times\,}}{\left({\frac{{\mathtt{7}}{!}}{{\mathtt{5}}{!}{\mathtt{\,\times\,}}({\mathtt{7}}{\mathtt{\,-\,}}{\mathtt{5}}){!}}}\right)} = {\mathtt{2\,520}}$$

-3(7+4) -2(7-9) = 48+7 -84

First we  sove the left hand side.

It is:

L.H.S- -3(7+4) -2(7-9)

        =-3*11  -2*(-2)

        =-33 +4

        = -29

Then we solve the right hand side.

It is:

R.H.S- 48+7-84

        = 55 - 84

        = -29

So that: L.H.S = R.H.S

Thanks Azia. 

3x+1 =21

3x     =21-1

3x     =20

x       =$${\frac{{\mathtt{20}}}{{\mathtt{3}}}}$$ = 6.66....

So that value of the x is 6.66