The president can quickly respond to economic social or political needs by

The president can quickly respond to economic social or political needs by signing executive orders.
Executive orders are orders that need to be signed and enforced quickly because there is a dire need for them. So if there are any problems of social, economic, or political nature that need to be solved as promptly as possible, the president can sign these executive orders and possibly solve the problem.

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160