How do you solve surface area

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.

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2