Answer: The total cost is
assuming the cost for 1 adult is
and the cost for 1 child is 
Step-by-step explanation:
Assuming the cost for 1 adult is
and the cost for 1 child is
:
and 
Then the expression that gives the total cost
is solved as:

(4.81 x 10^3) + (7.913 x 10^5)
(4810)+(791300) = 796,110 OR (79611 x 10)
The reasonable estimate of 288 can be 300 because it's close to 300
2 3/8 - 1 7/8
Change to improper fractions
19/8 - 15/8 = 4/8 = 1/2