Find the rate of change

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.

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position

Write a description of each inequality. 1. -5a + 3 > 1 2. 27 - 2b < -6 (this < has a _ under it) 3. 1/2 (c + 1) > 5 (this > has a _ under it)