Given:
a)
We get the following values from the graph.
b)
The given nth term of the sequence is
Required:
Step-by-step explanation:
a)
Expand the sum.
b)
Consider the summation.
The actual sum is 1515 which is greater than 1512
So this value is underestimated.
Final answer:
a)
b)
Underestimated.