Answer:
The expression that represent each person's share is: 
Step-by-step explanation:
To divide a pizza, or anything else, equally among a certain number of people, we need to divide the total of pizza available by the number of people who will eat the pizza. In this case there are 8 slices and 'p' people, therefore:

In order to validate the expression, we can see that if 8 people eat the pizza, each gets one slice, because 8 divided by 8 is 1, while if 4 people eat the pizza each get 2 and so on.
The expression that represent each person's share is: 
1. Census = D.
2.Sample = A.
3.Survey = E.
4. Population = B.
5. Inferences = C.
18/90 =0.2 You could also divide by 9 so your fraction would be = to 2/10 which may be easier for you.
I believe that it is a concurrent power