11
A diagonal connects a vertex to another vertex without being a side of the polygon. There are 14 vertices in a 14-gon. This leaves 13 vertices left to connect to (since we cannot connect the vertex to itself). However, two of these vertices will form the sides of the 14-gon. This leaves us with 11 possible diagonals we can draw.
B: a valet who parks your car at a restaurant
Selling price of boat: 1.3($10,000) = $13,000.
Salesman's commission: 0.25($13000-$10000) = 0.25($3000) = $750
