Answer:
D.
Step-by-step explanation:
This inequality does not have ≤ nor ≥. This indicates that when the inequality is graphed on a number line, it will be an open circle.
Using this information, we can eliminate options A, B, and C.
This inequality also indicates that 'd' is less than 4; 4 is greater than 'd.'
Since 'd' is less than 4, the line would go toward the numbers less than 4.
Looks like your function is
Rewrite it as
Recall that for , we have
If we replace with
, we get
By the ratio test, the series converges if
Solving for gives the interval of convergence,
We can confirm that the interval is open by checking for convergence at the endpoints; we'd find that the resulting series diverge.