Question

Please help I’m a bit stuck!!

Answer 1

Explanation:

From n=1, to n=4, plug this in the sigma notation

The first four terms of this series are

-4,-8/3,-16/9,-32/27

b. Since -1<r<1, the series diverge

c. The sum of an infinite geometric series is equal to

`(a)/(1 - r)`

Where a is the initial value and r is the rate

a=-4

r =2/3

`( - 4)/(1 - (2)/(3) ) = ( - 4)/( (1)/(3) ) = - 12`