Answer:
38
Step-by-step explanation:
-(5×-7-3)
-(-35-3)
-(-38)
38
An alternating series

converges if

is monotonic and

as

. Here

.
Let

. Then

, which is positive for all

, so

is monotonically increasing for

. This would mean

must be a monotonically decreasing sequence over the same interval, and so must

.
Because

is monotonically increasing, but will still always be positive, it follows that

as

.
So,

converges.
5/2 or 2.5
Hope this helps!