Solution:
Given:

when a = 4, substitute for a in the expression;

Therefore, if (a = 4), then

Hence, the answer is 16.
Answer:
1. 
2. 
Step-by-step explanation:
Let the number of people in the group be x. Denote the total cost as C.
1. If the regular cost is $21 per person, then the total regular cost for x people is 
2. If the special cost is $8 per person, then the total special cost for x people is
There is an additional $104 fee for a private room, thus the total special cost is 
Answer:
4
Step-by-step explanation:
plug in 2 for the a variables and you get 4 as the answer.
Answer:
499
Step-by-step explanation:
9,999 would be the greatest value
9500 would be the smallest value
if you subtract them you'll get 499