The final answer would be:
9x / (x-8)
The exact steps are shown in the attached picture.
Note that when dividing two fractions, we convert the division into multiplication and flip the second term.
Answer:

Step-by-step explanation:
(cylinder)
(rectangular prism)
(whole shape)
Answer:20.571
Step-by-step explanation:
x:y = 21: 24=7:8
8x=7y
y=8x/7
When x=18
y=8*18/7
y=20.571
Ashley can purchase 10 pizzas and Brian can purchase 12 so there would be nothing left on the cards
5/60=12
10/100=10
Here are some, 543,555, 543,123, and 543,369
Hope this helps