Pretty sure the answer is stiffness. Hope this helps.
The correct answer to this open question is the following.
The two intervention programs that the government could put into place to encourage tourists, not to litter would be the following.
1.- Advertising campaign in the United States airports. As soon as tourists arrive in the United States, there would be TV screens and signs in every airport, informing that littering is strictly prohibited in the United States.
2.- US embassies abroad. A similar campaign should be implemented in the many US embassies around the world. So when people solicit their visas to enter the United States, they could be informed that there is strict legislation in the US regarding littering.
This way tourist will be informed previous their arrival to the country.
These recommendations will help the illegal dumping situation for tourists in that they will be very aware that there will be serious consequences if they are caught littering.
The different rules for using parentheses is you have to do the equation in the parentheses first before you do any other equation first. You can also use PEMDAS.
