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
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?
Nth term:
Sum of n terms:
Plug in what you know and solve for a