Melody

Please try and refrain from giving full answers. 

Sometimes is ok but many people are here solely to cheat.  Clair is definitely one of those people.

Volume = area of the circle *  h

What is the area of the circle?    

Please no one, other than the asker, answer.

Ernie pains 1/2 a house per hour

Lizzie pains 1/5 of a house in an hour

Together they paint  1/5  +  1/2   =  7/10 of a house in an hour

So that is 10/7   hours per house

\(\frac{10hours}{7houses}*2 houses= \frac{20}{7}hours\)

So that is   

2 hours  51minutes and 26 seconds  to the nearest second.

I didn't get that answer.

The are of an ellipe is pi *a *b

Where a and be are the lengths of the semi-major and semi-minor axes,

The rest is explained here:

There are 2pi radians in a revolution.  Each time you do a whole revolution the sine value starts again.

sin(2pi + x) is the same as sinx

sin (4pi + x) is also the same as sinx

so sin    (13pi/3)  is the same as sin?

Answer this first.

write tan in terms of sin and cos

write cosec in terms of sine and cos

Multiply.  What do you get?

Hi Pizza,

This is the sum of a GP  (Geometric progression) which maybe you have not learned about yet.

The first term, a=1       (3^0=1)

The common ratio r=3       (because you keep multiplying by 3)

there are n+1 terms here (see if you can understand why it is not n)

The formula for the sum of a GP is       \(S_n=\frac{a(r^{n}-1)}{r-1}\)

But in this case n needs to be replaced with n+1  because there are n+1 terms.

\(S_{n+1}=\frac{a(r^{n+1}-1)}{r-1}\\ S_{n+1}=\frac{1(3^{n+1}-1)}{3-1}\\ S_{n+1}=\frac{(3^{n+1}-1)}{2}\\\)

You seem to have a + where there should be a -

Hi asinus and guest,

Thanks for answering asinus.

Your original answer of a=2 was a part of a correct answer.  

I substituted your other values in and I do not think that they work.

Guest is right. 

textot  gave a very cool answer for this.

Take a look  

Your question was automatically rejected all four  (or 5) times that you posted.

I am just guessing, but I think this is most likely because you used the word 'death'.  

Hi Textot,

This girl is using a few different identities and she is getting you and others here to do all her homework for her.

Please do not give her full answers like this.   Part answers and good hints are always better.

You can encourage her to interact with you.

You can make up a similar question if you like and show her how to do that one.

There are many options, just please do not give her answers that she can just copy.