A hyperbola centered at the origin has a vertex at (3,0) and a focus of the hyperbola is located at (9,0). What are the equations of the directrices?

12 3 4 5 6 7 8 9 10 time remaining 42: 01 ryan gathered data about the age of the different dogs in his neighborhood and the length of their tails. which best describes the strength of the correlation, and what is true about the causation between the variables?