Function: f(x)= -2(x-4)^2+3

is it increasing on (4, positive infinity)?

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.

How many verticies does a triangular prims have

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20