I’m studying for my Algebra class and need an explanation.

1. The equation represents a __________.
   

   		parabola
   		circle
   		hyperbola
   		ellipse

2 points

QUESTION 6

1. What is the directrix of the following graph?
   
   

   		y = -1
   		y = 1
   		x = 1
   		x = -1

2 points

QUESTION 7

1. What is the equation of the following graph?
   

   QUESTION 8

   1. What is the focus of the following graph?
      

      
      

      QUESTION 9

      1. What is the vertex of the following graph?
         

         
         

         QUESTION 13

         1. What is the axis of symmetry for the following parabola?
            
            

            		y = -3
            		x = -3
            		y = 3
            		x = 3

         2 points

         QUESTION 14

         1. What is the equation of the following graph?
            
            

            		x2 + y2 = 3
            		x2 + y2 = 9
            		x2 – y2 = 9
            		x2 – y2 = 3

         2 points

         QUESTION 15

         1. What is the center of the following graph?
            

            
            

            QUESTION 16

            1. What is the radius of the following graph?