1. Write statements to add two more lines of text to the end of the text file created. 2. Write statements to remove the second line of text from the text file you updated in the previous exercise. 3....

1. Write statements to add two more lines of text to the end of the text file created.

2. Write statements to remove the second line of text from the text file you updated in the previous exercise.

3. Write a program that reads and displays a text file that you create by using a text editor.

4. Revise the private method round so that it rounds to the nearest 10n, where n is an additional parameter.