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The number of ways of choosing 4 from 6 is ncr(6,4) → 6!/(4!*2!) → 15

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Use the cosine rule:  

cos(A) = (b² + c² - a²)/(2bc)

eg cos(A) = (10² + 7² - 6²)/(2*10*7) → 0.8071

A = cos^-1(0.8071) → 36.2º

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Use the calculator on the home page here - it gives sqrt(10)*sqrt(10) = 10

All calculators work to a limited numerical precision though, so you can't rely on all floating point calculations to provide exact answers.

Whaa......

If you want to round .52173913043 you would take the first two numbers and since two is smaller than five, you wouldn't round 5 up. Five and up you round to either ten or, in this case, 1, which is the answer.

Total when paying monthly: €(205.22 + 11*175.95) → €2140.67

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If there are two negative signs right next to each other it changes to a plus. So it is actually 0+3=3 

It is 0+3 = 3

the two frogs are frogs a and b

For those who may be interested, this is Max's question I am referring to

I did look at your calculus question Max but I'd have to look stuff up before I could have a hope of answering it.

It seemed like a lot of effort.  Having said that, it doesn't look like it should be that hard.  :/

It doesn't even look like calculus but that is probably just me displaying my total ignorance.....

Isn't there some simple formula you can use?

Btw no one is going to help me with my Calculus question :P

Nvm.

~The smartest cookie in the world

Oh. I see. 

Oops.

Yes I am very careless :P

~The smartest cookie in the world

Actually Max that was YOUR fault.

I copied and pasted the first line of your LaTex coding, that's how come I missed the -4 !

You might be the self proclaimed 'Smartest Cookie in the World" but you cannot claim to be the most careful one!  :))

\cfrac is slightly longer than \dfrac

Huh, where are you talking about Majid?

Oh yea - I copied the question wrong - you are of course correct :)

Good spotting :)

I tried to message you but this stupid site wont let me!  It keeps giving me an error message.

I can message everyone else.  I do not remember that ever happening before with anyone!

(yes I know you are a nice site, not stupid - please do not take offense and do any other horrible thing to me. )

LOL I am a cookie and no cookie is smarter than me. So I am the 'Smartest Cookie in the World' :P

I laughed so hard when Nauseated called himself a R. SOB 

~The smartest cookie in the world