Melody

Storks are not extinct.

That depends on what f is.  

Because it was Mr Ed and he really was a horse.  That takes me back.  Way before your time I would think.

I don't think that chickens like cheese.  So that answer is not likely to be right.  

This hyperbola has a transverse axis of length 26 and is centered at the origin. Which of the equations below could be its equation?

There are no equations below.  

what does stratified random sampling find in simple terms? Also, is there a difference between stratified random sampling and just random sampling?

My goodness this is testing the memory cells.

**Yes they are different.  

Say in a school.  children are stratified into different years.  In high school where i live (NSW, Australia) the stratas would be yr 7,8,9,10,11 and 12.

If a (year) stratified random sample of 60 children is taken then

10 children would be randomly chosen from year 7

10 from year 8

...

up to 10 from year 12.

To do this, maybe all the year 7 names are placed in a hat and 10 are randomly chosen. etc.

If the 60 children were taken as a random sample then the names of all the children in the whole school would be placed in the hat and 60 would be randomly chosen.

does that make sense?

Re: x^2-1/16x * 4x^2 / 5x + 5 

This is what you have asked - I suspect it is not what you really meant.

$$x^2-\frac{1}{16}\times x\times4\times\frac{x^2}{5}\times x +5\\\\
=x^2-\frac{4x^4}{80} +5\\\\
=x^2-\frac{x^4}{20} +5\\\\$$

If you meant something different, work out where your brackets need to be and make a brand new post.

That is probably the best way.

try looking here.

a² - 2a -3

IF you want to factorise it you have to find 2 numbers multiply to -3 (so one must be neg and one pos)

and add to -2 (the bigger looking one is actually negative)  must be -3 and +1

(x-3)(x+1)

On the other hand if you were asked to simplify it then you can't it already is as simple as it can be!

thanks Chris but you make this one look hard !

If you want to change a fraction to a percentage just multiply by 100 and put the % sign.

$$\frac{9}{20}\times 100\%\\\\
=\frac{9}{1}\times 5\%\\\\
=45\%$$

------------------------------------------------------------------------------ 

$$\frac{3}{25}\times100\%\\\\
=\frac{3}{1}\times4\%\\\\
=12%$$