How much does it cost for adults and children 2 and up ?

Not a lot but you should buy season passes they get you in all of the parks puls free parking on weekdays

I paid $44 each on line.

You should look at the price of a season pass. In the end you only have to go 2 times and it's paid for.

General Admission$49.99 Children Under 48"$39.99 Children 2 & Under

Through July 15th 2018 tickets are 40% off. If you happen to have a season pass for Six Flags entrance to the park is free.