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Thats really interesting CPhill!

Thank you!

Sorry, rosala...I should have explained more....Phi is the irrational number (1 + √5) / 2   ≈ 1.61803398874989485

If you have regular pentagon of side length = 1, then the length of one of its diagonals turns out to be "Phi"

Also....if you're familiar with the Fibonacci Series.......as the series grows larger, the ratio between a successive term and its preceding term tends towards Phi....!!

CPhill!whats "Phi"?

i didnt know such things had a formula too......(then maybe how much pain one would get in a punch has a formula too)

yeah it would be......seems like he's getting silent day by day !

even if it was....how would we know?Maths doesnt speak , does it? and we can only know truly if a person is stupid or not if they speak...but math doesnt so......shaniab is right.......math isnt!

1.61803398874989485^4 = 6.85410196624968457504

We could have also found this by summing ..... 1.61803398874989485^2 +1.61803398874989485^3........since Phi has the interesting property that Phi^n + Phi^(n + 1)  = Phi^(n + 2)......!!!!

tan45 - 7.cot45 + 5csc30 =

(1) - 7(1) + 5(2/1) =

1 - 7 + 10=

4

okay , thanks Chris

ok thank u

Yes mine was a little on the succinct side I guess.  Thanks Chris :)

He does that occasionally - it would be nice if he stayed and interacted with us for a while.  :(

I don't understand what you are asking Shaniab  

Oh maybe

Only the last one is an equation because it it the only one with an equal sign.  

Is that what you needed to know?

I had some rose plants but one died, now I only have 15 roses plants.  how many did I have to start with?

N-1=15

Yes, thank you Geno  

yes u right the answer is 2

no math is not stupid

879605*4665735=4.104002955*10 power to the 12 so u move the demcail point to 12 to the right so answer become 4102002955000

265 divided by 45 is equal to 5.888888889 to make it easy it be 5.88

I didn't know this - thanks Geno :)

Nice one, geno...!!!!

Derivatives are taken to find the slopes of tangent lines. They are also used to find maxima and minima.

I cannot tell when you will ever need to take the derivative of an example as the one that you gave.

3x²y - y

The degree of a polynomial is the degree of its highest degree term.

The degree of a term is the sum of the exponents of that term's variables. 

The term 3x²y has two variables:  x has an exponent of 2 and y has an exponent of 1; adding these together, the sum is 3; therefore, the degree of 3x²y is 3.  Another way of looking at this: if you write the term completely out, the term would be 3xxy; counting the number of variables (letters), there are three.

The degree of y is 1.

The highest degree is three; therefore, the degree of the polynomial is 3.

I KNOW IT'S 11.......wait sorry I say hand on heart it is 2

Dividing can be replaced by multiplying by the reciprocal.

The reciprocal of 2 is 1/2.

3/4 ÷ 2  =  3/4 x 1/2  =  (3 x 1) / (4 x 2)  =  3/8 

Another way of looking at this problem:

Dividing by 2 means taking one-half of it.

One-half of a fourth is an eighth; so one-half of 3/4 is 3/8.