A5= 24

r=2

Find A1.

hmmmm..I'm not sure how to do this one. I was absent the day we learned this in class. Thanks in advance.

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- Oct 27th 2007, 02:31 PMbeetzAnother geometric sequence ?
A5= 24

r=2

Find A1.

hmmmm..I'm not sure how to do this one. I was absent the day we learned this in class. Thanks in advance. - Oct 27th 2007, 02:44 PMPlato
$\displaystyle a_n = a_1 r^{n - 1}$

- Oct 27th 2007, 02:53 PMbeetz
24=A1(1)

....uuuhh....

?

I'm going off of memory here from my algebra class last year. I was absent the day this was taught in class, so I have no notes, and the textbook doesn't go over this. - Oct 27th 2007, 02:54 PMbeetz
OH NO.

It would be this:

24=A1(16), then solve for A1.

yeeeeeeeees? - Oct 27th 2007, 03:15 PMJhevon