1. M(x)=12x, with domain x < or =30, x a natural number {1,2,3,...30}
2. T(y)=12*30+15y
  Â
  T(y)=360+15y is the function which gives the wage after 30 hours of regular time and y of overtime.
3. T(y)=510
   360+15y=510
       15y=510-360=150
          y=10 hours of overtime (and 30 of regular time.