Melody

the money goes in at the very beginning of 2004 and this will be the value at the very beginning of 2008

It has been invested for exactly 4 full years :)

r is the rate.  if the interest rate is 5% per annum then r=0.05

$$FV=A(1+r)^4$$

Hi Michael,

This is a sipmlification of the formula because you would not be getting the interested added on yearly. Often it is accrued daily but added monthly.

If it was added monthly then this would be a better formula

$$FV=A\left(1+\frac{r\;(as\; a \;decimal)}{12}\right)^{(4*12)}$$

YES Rosala, one of our GREAT teachers  LOL  :))

YES  :)

Can y ask y his x left him?  

No probably not, maths teachers are supposed to be a bit weird like that.  LOL

Don't make another account !  Just change your password!   Duh !

Thanks Geno,

I always like these questions.   I have to think EVERY time.     

Thanks Geno - I like this question and answer.    

Hi Mellie, 

First you have to replace all the ts with (t-1)

$$\\f(t) = t^3 + 6t^2 + 12t + 8\\
f(t-1)=(t-1)^3+6(t-1)^2+12(t-1)+8\\$$

Now you have to expand it - do you know how to do that?

But Titanium, those ages (21,11 AND 8) only add up to 40   

Maybe some of the words are missing out of the question?