Answer:
40 * 6.5 = 260 --> D. 260.00
No it is not. They are the wrong points
To solve this problem you must apply the proccedure shown below:
1. You have that the time, given in the problem above, is written in decimal form.
2. To express this time in words, you must begin from left to right. First, write the digits before the point (58) and after the points (329) as whole numbers. Then, finish it writting the place name of the last digit, as following:
(Note: The point is expressed as "and").
58.329: Fifty eigth and three hundred twenty nine thousandths.
Therefore, the answer is: Fifty eigth and three hundred twenty nine thousandths.
Try this solution, if it is possible check it in the other sources.
P.S. for the radius of convergence: it is clear that all the members of the series (except the 1st and the 2d ones) are '0'.