Final answer:
To arrange the numbers in increasing order: 66,666; 77,777; 88,888; 99,999, option D is the correct order: 77,777, 66,666, 88,888, 99,999.
Step-by-step explanation:
To arrange the numbers in increasing order: 66,666; 77,777; 88,888; 99,999, we need to compare the numbers and place them in order from smallest to largest. Let's go through the options:
Option A: 66,666 - 77,777 - 88,888 - 99,999
Option B: 99,999 - 88,888 - 77,777 - 66,666
Option C: 88,888 - 77,777 - 66,666 - 99,999
Option D: 77,777 - 66,666 - 88,888 - 99,999
The correct answer is option D, because 77,777 is the smallest number, followed by 66,666, then 88,888, and finally 99,999. So the correct arrangement in increasing order is 77,777, 66,666, 88,888, 99,999.