By definition a counting number is all non-negative integers.
Answer:
An adults ticket costs $9
Step-by-step explanation:
Kids:
$7
Adults:
$9
So if you add 7+7+7= 21 (kids)
then do 9+9=18(adults)
Then add them together you get 39$
8/9 = .88888... = 88.89% after rounding
125/1000 because half of 0.5 is 0.25 and half of 0.25 is 0.125 and 0.125 is 125/1000