Answer:
the expression that represents the total cost would be:
total cost = Adult cost + Child cost
total cost = $4 + $2
total cost = $6
for a family of 2 adults and 2 children, the calculation would be as follows:
total cost for 2 adults = $4 × 2 = $8
total cost for 2 children = $2 × 2 = $4
total cost for the family = Total cost for 2 adults + Total cost for 2 children
total cost for the family = $8 + $4 = $12