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July 30, 2014

Posted by **Rusty** on Monday, January 31, 2011 at 8:26pm.

- math -
**bobpursley**, Monday, January 31, 2011 at 8:40pmIsn't this an arithemetic sequence?

distance=16, first term 35

Don't you have a formula for the sum of n terms? Use that, find n.

- math -
**Reiny**, Monday, January 31, 2011 at 8:45pmYou are dealing with an arithmetic series.

a = 35, d=16

Sum(n) = (n/2)(2a + (n-1)d)

700 = (n/2)(70 + 16(n-1))

1400 = n(70 + 16n - 16)

1400 = 54n + 16n^2

16n^2 + 54n - 1400 =0

solve the quadratic.

But remember that n must be a positive whole number.

Also check my arithmetic, I have no pencil, paper or calculator with me at the moment.

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