All Answers 352725 Answers

That is true anon, but how is your response related to the original question?

Don't fret, Melody. Plenty more fish in the ocean.

Sometimes a student will reveal an understanding about something the teacher had not anticipated in the model answer for an exam question. This can be a reason for awarding bonus marks. There are no hard and fast rules about awarding bonus marks, just so long as it is fair to all.

Okay Alan can you please spot the fault in my logic?

$$\\y=-x^3+2x^2+3x \qquad for \;\;x>3\\\\
$Inverse function$\\
x=-y^3+2y^2+3y \qquad for \;\;y>3\\\\
When\;\;x=6$$

I was going to keep going but I have already done it in my first post

@@ End of Day Wrap     Sun 10 /1/15     Sydney, Australia       Time 9:05pm       ♪ ♫

Hi all,

Today our intrepid answerers were CPhill, Tetration, Kingpifireplasma, Rosala, Alan, Heureka and SevenUP.

A big thank you to each of you :)

Inerest Posts:

1) Prove $${\sqrt{{\mathtt{10}}}}$$   is irrational.           Melody

Mon  12/1/15

1) Factorising a quadratic using grouping method     Melody.

I might go back and look at it again soon.

I want to ask you what might be wrong with some of my logic.     

Thanks SevenUP    

Thanks SevenUP   

Yes kingpi,

Some people think it is funny.  

Or at least they think that the responses that they get are funny.  

Yes it really was meant to be a smile - it was off my phone.   doesn't look much like a smile does it?

I need help smiling today - it was a genuine thank you. 

Of course you can join in 

Thanks Tetration - I have never seen that before.   

Let's hope the original poster comes back with the right answer from whoever set the question.

Thanks Alan :)

CH4 is a molecule.  It is made up of 5 atoms.  Do you want the number of molecules or the number of atoms?

A mole is Avogadro's number worth, so there are approximately 3*6.022×10²³ molecules of CH4 and 5 times that number of atoms in 3 moles of CH4.

.

Yes at the moment we are all reasonably sure that we are right.

It is just a pity that our answers are different.   :)

150kmx18x0.15nm

assuming km is kilometres and nm is nanometres  - this will be an area

1nm=10^-12 km

150*18*0.15*10^-12

=405*10^-12

=4.05*10^-10     km²

now there are 1000m in a km so 1000000=10⁶m² in 1 km²

=4.05*10-4     m²

no  there are 100cm in a metre so there are 10000=10⁴ cm² in 1m²

=4.05   cm²

Of course it would have been easier to do the conversions into cm right at the beginning.

you could do that and check that I didn't make any silly mistakes.    

I'm never very sure I'm right!  Sometimes I'm uncomfortably aware I'm wrong (though I'm sticking with my answer for f^-1(6) for now)!

.

3acx*2ax*4c

=3*2*4*a*a*c*c*x*x

=24a²c²x²

Like this

An excellent answer anonymous  

This might be easier Tetration

(x-2)/(x+4)-5/6=0 

$$\frac{x-2}{x+4}=\frac{5}{6}$$

 (You should be aware that x cannot equal -4)

 Multiply both sides by 6(x+4)  That will get rid of all the fractions. 

6(x-2)=5(x+4)

6x-12=5x+20

x=32

7*(-4)^3+2/(-4)^2

=7*-64+2/16

=-448+1/8

=-447 and 7/8

If you mean

26,000*(1+(0.043)*(5/3))

you can just type it into the calc on the home page.  :)