What is the perimeter of the shape? (quadratics)

4x - 8
3 - 2x
11 + y

And employees salary increase by $4500 which represents a 15% raise what is the employees new salary

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?