Chapter 8.5, Problem 66E

a.

To determine

To describe: That is happens to the value in sequence as n increases in the given graph.

Answer to Problem 66E

The terms get closer to zero and the terms alternate between positive and negative.

Explanation of Solution

Given:

The given graph is:

  

Calculation:

According to the graph, the value in sequence as nincreases, the terms get closer to zero and the terms alternate between positive and negative.

b.

To determine

To describe:the set of possible values of r.

Answer to Problem 66E

  $-1<r<0$ .

Explanation of Solution

Given:

The given graph is:

  

Calculation:

From part (a),

According to the graph, the value in sequence as n increases, the terms get closer to zero and the terms alternate between positive and negative.

Therefore, the set of possible values of r is $-1<r<0$ .