I need help again. I'm stuck on something.

If, in an Arithmetic Progression, U5 (5 term) =-.05 and the sum of the first 7 terms = 21, how can we find the first term?

Printable View

- March 6th 2011, 10:47 AMjubmamieIs there a way. Arithmetic Progressions. Again
I need help again. I'm stuck on something.

If, in an Arithmetic Progression, U5 (5 term) =-.05 and the sum of the first 7 terms = 21, how can we find the first term? - March 6th 2011, 11:06 AMe^(i*pi)
Nth term:

Sum of n terms:

Plug in what you know and solve for*a*