Question

For questions 7 and 8 evaluate each infinte geometric series.

Answer 1

2 summation ( -1/2)^n
Hint: use alternate sign and of sum when r < 1!

Answer 2

i still dont understand

Answer 3

(-1/2 ) ^ (n -1) = (-1/2)^n / ( -1/2)
= -2 summation of (-1/2)^n